How do I calculate the answer, please be very detailed, Thank You.
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Definition of standard error=(standard deviation)/sqrt(sample size)

=25/sqrt(50)=25/5sqrt(2)=5/sqrt(2) or 5sqrt(2)/2=3.5355 approx. This is the deviation of the sample mean from the population mean of 120.

Relative standard error=5sqrt(2)/240=2.95% (standard error/mean expressed as a percentage).

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