if the mean of the following distribution is 21 find the value of p.
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Given : Mean of the distribution is 21
To Find: Value of the P
Solution:
x d= x- Mean f df
10 -11 3 -33
15 -6 10 -60
20 - 1 p -p
25 4 7 28
35 14 5 70
-p + 5
-p + 5 = 0
=> p = 5
Hence value of the p is 5
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