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Question

If the mean of observations x,x+2,x+4,x+6 and x+8 is 11, find the value of x:

A
8
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B
5
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C
6
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D
7
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Solution

The correct option is C 7
Mean of observations x,x+2,x+4,x+6,x+8 is 11
Mean =SumNumber of observation
Mean =x+x+2+x+4+x+6+x+85=11
5x+205=11
5x+20=55
5x=5520
5x=35
x=7
Hence the answer is option D

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