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Question
The mean of a set of numbers is `bar(X)`. If each number is multiplied by z, the mean is
Options
`bar(X) + z`
`bar(X) - z`
`zbar(X)`
`bar(X)`
Solution
`zbar(X)`
Explanation;
Hint:
If each observation is multiplied by k, k ≠ 0 then the arithmetic mean is also multiplied by the same quantity.
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