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Question

If the mean of x,x+3,x+5,x+7 and x+10 is 9, then the value of second observation is ____.

A
5
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B
6
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C
7
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D
8
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Solution

The correct option is C 7
Mean of x,x+3,x+5,x+7 and x+10 = 9
x+(x+3)+(x+5)+(x+7)+(x+10)5=9
5x+255=9
x=4
So, the second observation, x+3=7.

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