4. Chick-fil-a Insider reports the prices of a chicken sandwich in 10 cities: $2.25, $2.45, $2.54, $2.78, $2.38, $2.64, $2.75, $2.81, $2.50 and $2.60. (5 Points) a. What is the point estimate of the population mean chicken sandwich price? b. What is the point estimate of the population standard deviation? c. Develop a 99% confidence interval estimate of the population mean chicken sandwich price.