Question

Calculate standard deviation of marks secured by 100 examinees in the examination:
Marks
10-20
20-30
30-40
40-50
50-60
60-70
70-60
60-90
Number of Examinees
19
3
2
49
24
2
0
1

(Ans. O = 14.1​

Answer 1

Answer:

14.1:3;3;3;-3+3+4+3((3938392

Answer 2

Answer:

sorry l don't know the answer