Question

Calculate standard Deviation from the furowing tata
class intervale
Frequency
20-25
25-30
30-35
35-40
40-45
45-50
​

Answer 1

Answer:

X Mid point (x) Frequency (F) i=class interval width A=22.5 Assumed mean u=

i

x−A

fu

0-5 2.5 3 5 22.5 -4 -12

5-10 7.5 5 5 22.5 -3 -15

10 -15 12.5 7 5 22.5 -2 -14

15-20 17.5 8 5 22.5 -1 -8

20-25 22.5=A 10 5 22.5 0 0

25-30 27.5 11 5 22.5 1 11

30-35 32.5 14 5 22.5 2 28

35-40 37.5 19 5 22.

5 3 57

40-45 42.5 15 5 22.5 4 60

45-50 47.5 13 5 22.5 5 65

Σf=105