Question: 7.85 A teacher selected a random sample of 170 primary students from her school. They were asked what amount they received as daily pocket money.

7.85 A teacher selected a random sample of 170 primary students from her school. They were asked what amount they received as daily pocket money. The sample mean response was €2.50, and the sample standard deviation was €1.85. Based on these results, the teacher determined a confidence interval extending from €1.30 to €2.05 for the population mean of monthly household expenditure. Find the confidence level of the interval.

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