Home work assistance please! /:

1. In a recent study of 39 ninth-grade students, the mean number of hours per week that they played video games was 86.6. The population standard deviation was 3.8. a. Find the best point estimate of the population mean. b. Find the 90% confidence interval of the mean of the time playing video games. c. Find the 95% confidence interval of the mean of the time playing video games. 2. How large a sample is needed to estimate the population mean for the amount of money a person spends weekly on pastries within $3.50 and be 95% confident? The standard deviation of the population is $6.85