A random sample of 100 packs of apples with a professed weight of 1kg was found to have mear 1020g and standard deviation 12g. a) Find a 95% confidence interval for the mean weight of all such packs of apples. b) Does the interval include 1kg? Can you think of a reason (which any retailer would be able- to tell you) why you might expect the interval not to include 1kg? c) What confidence level would have resulted in the interval just about including 1kg?

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