Question

(Ans. : X = 22.38)
1. Calculate the mean from following marks obtained by 40 students in a certain
test :
Marks
No. of students
0 or more than 0
40
10 or more than 10
36
20 or more than 20
28
30 or more than 30
15
40 or more than 40
5
(Ans. : X = 26 Marks.) [ 11 ]
5
3
11​

Answer 1

Explanation:

Here we have, the cumulative frequency distribution. So, first we convert it into an ordinary frequency distribution. we observe that are 80 students getting marks greater than or equal to 0 and 77 students have secured 10 and more marks. Therefore, the number of students getting marks between 0 and 10

is 80-77= 3.

Similarly, the number of students getting marks between 10 and 20 is 77-72%= 5 and so on. Thus, we obtain the following frequency distribution. Marks Number of students

half answer is in the photo...