Question

Example 3 : Calculate standard deviation of the following table :
05
10
15
20
25
Weekly Expenditure below
06
16
28
38
No. of students
46
bution tobie as below​

Answer 1

Step-by-step explanation:

No. of students

(f

i

) x

i

x

i

f

i

0-10 12 5 60

10-20 18 15 270

20-30 27 25 675

30-40 20 35 700

40-50 17 45 765

50-60 6 55 330

Σf

i

=100 Σx

i

f

i

=2800

∴Mean=

Σf

i

Σx

i

f

i

=

100

2800

=28