7.6 According to CleanTechnica website, Sweden’s full electric vehicles took a record high 24.1%

share of new sales, with the Kia e-Niro being Sweden’s best-selling full electric vehicle. Suppose you are an employee at a Kia showroom in Sweden. You are asked by your manager to provide an overview of the range that these electric cars can drive on a single battery.

A random sample of 54 cars is used. The data are stored in the data file Electric Cars.

a. Is there evidence that the data are not normally distributed?

b. Find a minimum variance unbiased point estimate of the population mean.

c. Find a minimum variance unbiased point estimate of the population variance.