Question: I need help with this problem: thank you 3. The completion time of a particular activity follows normal distribution. A sample data on completion times

I need help with this problem:

thank you

3. The completion time of a particular activity follows normal distribution. A sample data on completion times has the following numerical summary: Completion n a Mean Std. St Variance Sum Margin Precision of time error of Dev. of error confidence mean interval X 50 0.05 ? 38.4 900 a) Fill in the missing quantities b) From this information, construct 95% and 90% two-sided confidence intervals for the population mean. Which of these is more precise and why

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