Given table in the question is as follows:
| Unit Test | $I$ | $II$ | $III$ | $IV$ | $V$ | $VI$ |
| Percentage of marks obtained | $72$ | $67$ | $69$ | $74$ | $71$ | $76$ |
(iii)
The total number of times students get less than $65%$ marks in a unit test $=0$
Now,
P(less than $65%$ marks in a unit test)
= (Number of times student gets less than $65%$ marks in a unit test)/(total
number of tests taken by a student)
$=0/6$
$=0$