Ask a Question

A lot consists of 144 ballpoint pens of which 20 are defective and others good. Tanvy will buy a pen if it is good, but will not buy it if is defectiv

in Education by
A lot consists of 144 ballpoint pens of which 20 are defective and others good. Tanvy will buy a pen if it is good, but will not buy it if is defective. The shopkeeper draws one pen at random and gives it to her. What is the probability that (i) she will buy it, (ii) she will not buy it? Select the correct answer from above options

1 Answer

0 votes
by
 
Best answer
Correct Answer - ` (i) 31/36 (ii) 5/36` Total number of pens = 144. Number of defective pens = 20. Numbers of non-defective pens = 144-20 = 124. (i) P(buying the pen) = P(getting a non-defective pen) = ` (124)/(144) = 31/36`. (ii) P(not buying the pen ) = P(getting a defective pen) = 20/144 = 5/35`.

Related questions

0 votes
Q: A lot consists of 144 ball pens of which 20 are defective and others good.
    A lot consists of 144 ball pens of which 20 are defective and others good. Nuri will buy a pen if it is good, ... ) She will not buy it Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
0 votes
Q: A lot consists of 144 ball pens of which 20 are defective arid the others are good.
    A lot consists of 144 ball pens of which 20 are defective arid the others are good. Nuri will buy a pen if it ... She will not buy It? Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
0 votes
Q: 12 defective pens are accidently mixed with 132 good ones. It is not possible to just look at pen and tell whether or not it is defective. One pen is
    12 defective pens are accidently mixed with 132 good ones. It is not possible to just look at pen and tell whether ... out is good one. Select the correct answer from above options...
asked Nov 17, 2021 in Education by JackTerrance
0 votes
Q: A lot consists of 48 mobile phones of which 42 are good, 3 have only minor defects and 3 have major defects. Varnika will buy a phone,
    A lot consists of 48 mobile phones of which 42 are good, 3 have only minor defects and 3 have major ... acceptable to the trader? Select the correct answer from above options...
asked Nov 21, 2021 in Education by JackTerrance
0 votes
Q: (i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? (ii) Su
    (i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the ... bulb is not defective ? Select the correct answer from above options...
asked Nov 17, 2021 in Education by JackTerrance
0 votes
Q: A carton consists of 100 shirts of which 88 are good and 8 have minor defects. Rohit, a trader, will only accept the shirts which are good, But, Kamal
    A carton consists of 100 shirts of which 88 are good and 8 have minor defects. Rohit, a trader, will only accept ... and (ii) Kamal? Select the correct answer from above options...
asked Nov 17, 2021 in Education by JackTerrance
0 votes
Q: A lot of 100 watches is known to have 10 defective watches. If 8 watches are selected (one by one with replacement) at random,
    A lot of 100 watches is known to have 10 defective watches. If 8 watches are selected (one by one with ... least one defective watch? Select the correct answer from above options...
asked Nov 20, 2021 in Education by JackTerrance
0 votes
Q: A box has 100 pens of which 10 are defective. What is the probability that out of a sample of 5 pens drawn
    A box has 100 pens of which 10 are defective. What is the probability that out of a sample of 5 pens drawn ... most one is defective? Select the correct answer from above options...
asked Nov 19, 2021 in Education by JackTerrance
0 votes
Q: A basket contains 20 apples and 10 oranges out of which 5 apple and 3 orange are defective. If a person takes out 2 at random what is the probability
    A basket contains 20 apples and 10 oranges out of which 5 apple and 3 orange are defective. If a person takes ... or both are good? Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: A box contains 100 bulbs 20 of which are defective. 10 bulbs are selected for inspection. Find the probability that: i. all 10 are defective ii. all 1
    A box contains 100 bulbs 20 of which are defective. 10 bulbs are selected for inspection. Find the probability ... none3 is defective. Select the correct answer from above options...
asked Nov 15, 2021 in Education by JackTerrance
0 votes
Q: A jar contains 24 marbles. Some of these are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green
    A jar contains 24 marbles. Some of these are green and others are blue. If a marble is drawn at random from ... marbles in the jar. Select the correct answer from above options...
asked Nov 17, 2021 in Education by JackTerrance
0 votes
Q: The probability that a certain person will buy a shirt is 0.2, the probability that he will buy a coat is 0.3 and the probability
    The probability that a certain person will buy a shirt is 0.2, the probability that he will buy a coat is 0.3 ... a shirt and a coat. Select the correct answer from above options...
asked Nov 16, 2021 in Education by JackTerrance
0 votes
Q: 12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen
    12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell ... is a good one. Select the correct answer from above options...
asked Nov 25, 2021 in Education by JackTerrance
0 votes
Q: There is a box containing 30 bulbs, of which 5 are defective. If two bulbs are chosen at random from the box in succession
    There is a box containing 30 bulbs, of which 5 are defective. If two bulbs are chosen at random from the ... are chosen are defective? Select the correct answer from above options...
asked Nov 16, 2021 in Education by JackTerrance

© Copyright 2018-2023 www.Blogmepost.com. All rights reserved. Developed by Blogmepost.

...