40. Find the mean of the following frequency distribution: (Using
step deviation method)
Class interval 0-20 20-40 40-60 60-80 80-100
No. of Workers 15 18 21 29 17
Answers
Answer:
53
Step-by-step explanation:
Class interval Frequency Mid-values Deviation D' Fd'
(X) (D=X-A)
(A=50) (D'=d/C)
0-20 15 10 -40 -2 -30
20-40 18 30 -20 -1 -18
40-60 21 50 0 0 0
60-80 29 70 20 1 29
80-100 17 90 40 2 34
X= A+ ∑fd' / ∑f * C
= 50+ 15 / 100 * 20
= 53
Answer:
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Step-by-step explanation:
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