find mean and s.d
x 60-62 63-65 66-68 69-71 72-74
__|______|_____|_____|_____|____
t 5 18 42 27 8
Answers
Given : x 60-62 63-65 66-68 69-71 72-74
__|______|_____|_____|_____|____
t 5 18 42 27 8
To Find mean
Solution:
Class Mean f d=(mean - 67)/3 df
59.5 - 62.5 61 5 -2 -10
62.5 - 65.5 64 18 -1 -18
65.5 - 68.5 67 42 0 0
68.5 - 71.5 70 27 1 27
71.5 - 74.5 73 8 2 16
100 15
Mean = 67 + 3 * 15/100
= 67 + 0.45
= 67.45
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