What is the weight henry can be 95 confident the mean falls

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Henry Lom feels that the quantity of chocolates in a particular type of packet has decreased. To test this feeling he takes a sample of 40 packets and finds that the mean weight is 228 g with a standard deviation of 11 g. What is the weight Henry can be 95% confident the mean falls below? What are the two-sided confidence limits on this weight?

Reference no: EM13584419

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