Find the mean of weekly wages of the data given below by using the assumed-mean method.

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Rs.891.2

Rs.991.2

Rs.871.2

Rs.971.2

answer is A.

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Detailed Solution

The following data is given below:
Question Image

Let’s suppose, assumed mean A = 900.
The formula used for calculating the

d i

is,

d 1 = x 1 − 900,

where

x i

is weekly wages.
Question Image

Calculate

f i d i .

∴ ∑ f i d i = − 880 and ∑ f i = 100.

Now, Mean = f i d i f i + A ⇒ Mean = − 880 100 + 900 ⇒ Mean = Rs . 891.2

Therefore, the mean of weekly wages of the data given above is Rs.891.2.
Hence, option (1) is correct.

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