Eh this is probably correct ?
72 is equal to 80% of a number n. Write and solve and equation to find n. Write the percent as a decimal.
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The standard error of the mean is given by:
where sigma is the standard deviation and n is the sample size. In this case the sample size is 10 and the standard deviation is 0.657, then the standard error is:
Therefore the standard error is $0.208.