A random sample of eight homes in a particular suburb had the following selling prices (in thousands of dollars):
192 183 312 227 309 396 402 390
a. Check for evidence of nonnormality.
b. Find a point estimate of the population mean that is unbiased and efficient.
c. Use an unbiased estimation procedure to find a point estimate of the variance of the sample mean.
d. Use an unbiased estimator to estimate the proportion of homes in this suburb selling for less than $250,000.