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Question

For the following data, mean of x is found to be 7.3. The missing frequency is
x : 5 6 7 8 9
f : 4 6 12 - 8


A

10

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B

9

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C

8

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D

7

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Solution

The correct option is A

10


Mean=5×4 + 6×6 + 7×12 + 8×f + 9×84 + 6 + 12 + f + 8
Where f is the missing frequency
7.3=20 + 36 + 84 + 8f + 7230 + f=212+8f30+f219+7.3f=218+8f7=.7ff=7.7=707=10


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