Question: It has been claimed that the average household receives 50 pieces of mail per month. To test this claim, a researcher surveyed five randomly selected households and found the number of pieces of mail received by each household last month to be: 40 45 48 52 50 Using a 5% significance level, can the researcher conclude that the mean number of pieces of mail received per month per household is not 50? Assume the number of pieces of mail received per household per month for all households has an approximate normal distribution. Use the critical value approach.

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