Question

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

Unit Test	l	ll	lll	lV	V	Vl
Percentage of marks obtained	72	67	69	74	71	76

Based on this data find the probability that the student gets

(i) More than 70% marks in a unit test.

Answer 1

The total number of tests taken by a student = 6

The number of times a student gets more than 70% marks in a unit test = 4 

P(More than 70% marks in a unit test)

= `"Number of times student gets more than 70% marks in a unit test"/"Total number of tests taken by a student"`

= `4/6 = 2/3`