Estimated mean becomes the actual arithmetic mean if _______.

Deviations are greater than median

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Mode is greater than median

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Average of deviations is zero.

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Sum of deviations exceeds the number of observations

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Solution

The correct option is C Average of deviations is zero.
As we know ,

Arithmetic mean = Estimated mean + Average of deviations

When average of deviations = 0,

Arithmetic mean = Estimated mean + 0
= Estimated mean

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