Question

From the following distribution, calculate Standard Deviation by Step Deviation Method, taking Assumed Mean = 35.          6   

X 

10 – 20

20 – 30

30 – 40

40 – 50

50 – 60

60 – 70

Frequency

18

22

40

32

18

10​

Answer 1

Answer:

answer is 90

Explanation:

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