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Question

A simple random sample of 100 observations was taken from a large population. The sample mean & the standard deviation were determined to be 80 and 12 respectively. The standards error of mean is
  1. 1.2

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Solution

The correct option is A 1.2

Standard error of mean
=σn=12100=1.2

(σ= S.D. of sample, n = size of the sample


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