A random sample of 10 homes in a particular suburb had the following selling prices (in thousands of pounds):

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 £280,000.

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