1. In a random sample of 60 computers, the mean repair cost is $150 with a standard deviation of $36. Construct a 99% confidence interval for the population mean.
2. A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normally distributed. $3.60 $4.50 $2.80 $6.30 $2.60 $5.20 $6.75 4.25 $8.00 $3.00. Find the 95%confidence interval for the population mean.