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Mathematics 9 Online
downfallofusall:

The mean score on a biology exam taken by all undergraduate students in a college in a particular year is 67.8 with a standard deviation of 11.5. The standard error of the mean for a sample of 70 students is , and the margin of error of the mean is . (Round off your answers to the nearest hundredth.)

harliii:

Standard error = standard deviation/sqrt(sample size) = 11.5/sqrt(70) = 1.375 Margin of error = 67.8 + or - 1.375

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