The table given below shows the marks obtained by 30 students in a test.

Marks (class interval)

Number of students (frequency)

1-10

7

11-20

10

21-30

6

31-40

4

40-50

3

Out of these students, one is chosen at random. What is the probability that his marks lie in the interval 21-30?

Question

Philoid · Accepted Answer

Total number of Students: 30

Number of Students having marks in the range 21-30: 6

Probability P() =

1.Let P(S) be probability of selecting a student having marks in the range 21-30

P (S) =

P (S) = = 0.2

Marks (class interval)	Number of students (frequency)
1-10	7
11-20	10
21-30	6
31-40	4
40-50	3

The table given below shows the marks obtained by 30 students in a test.Marks (class interval)Number of students (frequency)1-10711-201021-30631-40440-503Out of these students, one is chosen at random. What is the probability that his marks lie in the interval 21-30?