A large stock-broking firm expects its traders to close at least 800 deals per
trader per annum. The firm is concerned that newly recruited traders are underperforming.
A random sample of eighteen newly recruited traders in the company
reveals the following number of deals closed annually. Assume these data follow a
normal distribution. Use a 0.05 level of significance to establish if the firm’s
concerns are justified with respect to the newly recruited traders. In computing the
sample statistics, round up to one decimal place to ease calculations.