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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.
Sum
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Solution
Given that the mean of observations x, x + 2, x + 4, x + 6 and x + 8 is 11.
Mean = `"Observations"/n`
11 = `[ x + x + 2 + x + 4 + x + 6 + x + 8]/5`
11 = `[ 5x + 20 ]/5`
x = `35/5`
∴ x = 7
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