Total number of unit tests taken = 5
We know, Probability of an event = (Number of Favorable outcomes) / (Total Numbers of outcomes)
(i) Number of times student got more than 70% = 3
Probability (Getting more than 70%)
=
3
5
= 0.6
(ii) Number of times student got less than 70% = 2
Probability (Getting less than 70%)
=
2
5
= 0.4
(iii) Number of times student got a distinction = 1
[Marks more than 75%]
Probability (Getting a distinction)
=
1
5
= 0.2