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a sugar content in one cup serving of a cereal was measured for a sample of...

a sugar content in one cup serving of a cereal was measured for a sample of 140 servibgs. the acerage was 11.9 abs the standard deviation was 1.1 g.
find ta 95% cobfidence intefval for the mean sugar content.
what is the confidence level of the interval (11.81, 11.99)
how large a sample is neededso that a 95% confidence interval specifies the mean within +~0.1?

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