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Arithmetic Mean

The mean of o...

Question

The mean of observations $x, 2 x + 1, 2 x + 5$ and $2 x + 9$ is 30 then x is

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Solution

Given,Mean of x , 2x +1 , 2x+5 , 2x + 9 is 30
mean = ( x+2x+1 +2x + 5 + 2x + 9 )/4 = 30
7x + 15 = 120
7x = 120- 15
7x = 105
x = 105 / 7
x = 15

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