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Question

While calculating the mean of a given data by the assumed-mean method, the following values were obtained:

A = 25, ∑ fidi = 110, ∑ fi = 50.

Find the mean.

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Solution

According to assumed-mean method,

x¯=A+ifidiifi =25+11050 =25+2.2 =27.2

Thus, mean is 27.2.

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