Use the chi-square goodness-of-fi t test to determine if the observed data below are normally distributed. Let a 5 0.05. What are your estimated mean and standard deviation?

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Category 10-under 20 Observed. 6 20-under 30 14 30-under 40 29 40-under 50 38 50-under 60 25 60-under 70 10 70-under 80 7