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Question
The heights of 60 students of a class are given in the following table :
| Height(in cm) | 150-155 | 155-158 | 158-160 | 160-165 | 165-172 |
| No. of students | 8 | 20 | 25 | 4 | 3 |
Find the probability that the height of a student lies in the interval
(i) 155-158
Solution
The total number of students = 60
Total number of students whose height lie in the interval 155-158=20
P(Height of a student lies in the interval 155-158)
= `"Number of students whose height lies in the interval 155 -158 "/"Total number students"` = `20/60` = `1/3`
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