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Standard IX

Mathematics

Mean

The mean of n...

Question

The mean of n observations is X. If k is added to each observation, then the new mean is

(a) X

(b) X + k

(c) X − k

(d) kX

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Solution

Let us take n observations.

Ifbe the mean of the n observations, then we have

Add a constant k to each of the observations. Then the observations becomes

Ifbe the mean of the new observations, then we have

Hence, the correct choice is (b).

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The mean of n observations is X. If k is added to each observation, then the new mean is (a) X (b) X + k (c) X − k (d) kX

Let us take n observations. Ifbe the mean of the n observations, then we have Add a constant k to each of the observations. Then the observations becomes Ifbe the mean of the new observations, then we have Hence, the correct choice is (b).

The mean of n observations is X. If k is added to each observation, then the new mean is

(a) X

(b) X + k

(c) X − k

(d) kX

Let us take n observations.

Ifbe the mean of the n observations, then we have

Add a constant k to each of the observations. Then the observations becomes

Ifbe the mean of the new observations, then we have

Hence, the correct choice is (b).