Appliance Magazine provided estimates of the life expectancy of household appliances. A simple random sample of 10 VCRs show the following useful life in years.
6.5 8.0 6.2 7.4 7.0 8.4 9.5 4.6 5.0 7.4
a. develope a point estimate of the population mean life expectancy for VCRs.
b. develop a point of the population standard deviation for life expectancy of VCRs.