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Q: In answering a question on a multiple r. choice test, a student either knows the answer or guesses.
    In answering a question on a multiple r. choice test, a student either knows the answer or guesses. Let 3 ... answered it correctly ? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A laboratory blood test is 99% effective in detecting a certain disease when it is in fact, present.
    A laboratory blood test is 99% effective in detecting a certain disease when it is in fact, present. However, ... result is positive ? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: There are three coins. One is a two headed coin (having head on both faces),
    There are three coins. One is a two headed coin (having head on both faces), another is a based coin that ... the two headed coin? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: An insurance company insured 2000 scooter drivers, 4000 car drivers and 6000 truck drivers.
    An insurance company insured 2000 scooter drivers, 4000 car drivers and 6000 truck drivers. The probability of an ... scooter driver? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A factory has two machines A and B. Past record shows that machine A produced 60%
    A factory has two machines A and B. Past record shows that machine A produced 60% of the items of output and ... produced by machine B? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Two groups are competing for the position on the Board of directors of a corporation.
    Two groups are competing for the position on the Board of directors of a corporation. The probabilities that the ... the second group. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Suppose a girl throws a die. If she gets a 5 or 6, she tosses a coin three times
    Suppose a girl throws a die. If she gets a 5 or 6, she tosses a coin three times and notes the number of heads ... 3 or 4 with the die? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A manufacturer has three machine operators A, B and C. The first operator A produces 1% defective items,
    A manufacturer has three machine operators A, B and C. The first operator A produces 1% defective items, where as ... produced by A? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A card from a pack of 52 cards is lost. From the remaining cards of the pack, two cards are . drawn
    A card from a pack of 52 cards is lost. From the remaining cards of the pack, two cards are . drawn and ... lost card being a diamond. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Probability that A speaks truth is 4/5 A coins is tossed. A reports that a head appears.
    Probability that A speaks truth is 4 5 4 A coins is tossed. A reports that a head appears. The probability that actually ... (D) 2 5 2 Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: If A and B are two events such that A⊂B and P(B) ≠ 0,then which of the following is correct?
    If A and B are two events such that A⊂B and P(B) ≠ 0,then which of the following is correct? (A) P(A|B) = ... ≥ p(A) (D) None of these Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: State which of the following are not the probability distributions of a random variable.
    State which of the following are not the probability distributions of a random variable. Give reasons for your answer. (i) ... 0.1 0.05 Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: An urn contains 5 red and 2 black balls.Two balls are randomly drawn.
    An urn contains 5 red and 2 black balls.Two balls are randomly drawn. Let X represent the number of black ... a random variable ? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed 6 times.
    Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed 6 ... values of X? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Find the probability distribution of (i) number of heads in two tosses of a coin.
    Find the probability distribution of (i) number of heads in two tosses of a coin. (ii) number of tails in the ... tosses of a coin. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Find the probability distribution of the number of successes in two tosses of a die, where a success is defined as
    Find the probability distribution of the number of successes in two tosses of a die, where a success is defined as ... at least one die Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: From a lot of 30 bulbs which include 6 defectives, a sample of 4 bulbs is drawn at random with’ replacement.
    From a lot of 30 bulbs which include 6 defectives, a sample of 4 bulbs is drawn at random with' replacement ... of defective bulbs. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A coin is biased so that the head is 3 times as likely to occur as tail. If the coin is tossed twice,
    A coin is biased so that the head is 3 times as likely to occur as tail. If the coin is tossed twice, ... of number of tails. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A random variable X has the following probability distribution:
    A random variable X has the following probability distribution: x 0 1 2 3 4 5 6 7 P(x) 0 k 2k 2k 3k k2 2k2 7k2 + ... < x < 3) (iv) P(0 Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: The random variable X has a probability distribution P(X) of the following form, where k is some number:
    The random variable X has a probability distribution P(X) of the following form, where k is some number: P(X)={ k,ifx= ... ), P (X ≥ 2) Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Find the mean number of heads in three tosses of a fair coin.
    Find the mean number of heads in three tosses of a fair coin. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Two dice are thrown simultaneously. If X denotes the number of sixes, find the expectation of X.
    Two dice are thrown simultaneously. If X denotes the number of sixes, find the expectation of X. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Two numbers are selected at random (without replacement) from the first six positive integers.
    Two numbers are selected at random (without replacement) from the first six positive integers. Let X denote the larger ... Find E(X). Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Let X denote the sum of the numbers obtained when two fair dice are rolled. Find the variance and standard deviation of X.
    Let X denote the sum of the numbers obtained when two fair dice are rolled. Find the variance and standard deviation of X. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20, 16, 18, 20, 17, 16, 19 and 20 years.
    A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20, 16, 18, 20, 17, 16, ... , variance and standard deviation of X. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: In a meeting, 70% of the members favour and 30% oppose a certain proposal.
    In a meeting, 70% of the members favour and 30% oppose a certain proposal. A member is selected at random and we take ... and Var (X). Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: The mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on one face is
    The mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on one face ... (C) 5 (D) 1 Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: Suppose that two cards are drawn at random from a deck of cards.
    Suppose that two cards are drawn at random from a deck of cards. Let X be the number of aces obtained. Then the value ... 1 13 (D) 2 13 Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: A die is thrown 6 times. If ‘getting an odd number’ is a success, what is the probability of
    A die is thrown 6 times. If getting an odd number' is a success, what is the probability of (i) 5 successes ... ) at most 5 successes? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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Q: There are 5% defective items in a large bulk of items. What is the probability that
    There are 5% defective items in a large bulk of items. What is the probability that a sample of 10 items will ... one defective item ? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
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