Question

The percentage of marks obtained by a student in monthly unit test are given below:

Unit test I II III IV V VI

Percentage

of marks

obtained

52 60 65 75 80 72

Find the probability that in the next test the student gets

(i) More than 70% marks

(ii) At least 60% marks

(iii) Less than 70% marks​

Answer 1

Step-by-step explanation:

i)

Total no. of unit tests =6

Number of tests in which the student scored more than 70% marks = 1

Therefore,

Probability that a student gets more than 70% marks =

Total no. of tests

No. of tests in which the student scored more than 70% marks

P(A)= 1/6

P(A) = 0.167

ii)

P(B) = {52,60}

P(B) = 2 / 6

P(B) = 0.33

iii)

P(C) = {52,60,65}

P(C) = 3 / 6

P(C) = 0.5