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Question

If the mean of 5 , 8 , 9 , 6, 12 , p is 7,then find the value of p.

A
10
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B
2
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C
7
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D
4
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Solution

The correct option is D 2
The mean of n observation is given by
Sum of n observationnumber of observation
Here , Mean = 7
The sum of the observations = 5 + 8 + 9 + 6 +12 + p = 40 + p

Hence 40+p6=7
40 + p = 42
p = 2

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