Find out the missing frequency when mean is 29
X
5
15
25
35
45
55
F
5
7
?
18
5
3
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Answer:
Given : Mean is 29
x 5, 15, 25, 35, 45, 55,
f- 5, 7, ? ,18, 5, 3
Let missing Frequency x
x A= (x - 25)/10 f fA
5 -2 5 -10
15 -1 7 -7
25 0 ? 0
35 1 18 18
45 2 5 10
55 3 3 9
38 + ? 20
29 = 25 + 10 * ( 20 ) / (38 + ? )
=> 4 = 200 / (38 + ?)
=> 38 + ? = 50
=> ? = 12
missing frequency is 12
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