What are confidence limits for estimates of mean of grades

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Reference no: EM13254675

A random sample of 50 mathematics grades out of a total of 200 showed a mean of 75 and a standard deviation of 10.

(a) What are the 95% confidence limits for estimates of the mean of the 200 grades?

(b) With what degree of confidence could we say that the mean of all 200 grades is 75 + or - 1?

Reference no: EM13254675

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