Question: Home Mail Corporation sells products by mail. The company's management wants to find out if the number of orders received at the company's office on each of the 5 days of the week is the same. The company took a sample of 400 orders received during a 4-week period. The following table lists the frequency distribution for these orders by the day of the week.

Day of the week                      Mon           Tue            Wed           Thu          Fri

Number of orders received          92             71               65             83           89

Test at the 5% significance level whether the null hypothesis that the orders are evenly distributed over all days of the week is true.