K The waiting time to check out of a supermarket has had a population mean of 9.87 minutes. Recently, in an effort to reduce the waiting time, the supermarket has experimented with a system in which there is a single waiting line with multiple checkout servers. A sample of 60 customers was selected, and their mean waiting time to check out was 8.91 minutes with a sample standard deviation of 4.9 minutes. a. At the 0.05 level of significance, using the critical value approach to hypothesis testing, is there evidence that the population mean waiting time to check out is less than 9.87 minutes? What are the null and alternative hypotheses for this test? OA Ho: H8.91 H: >8.91 OD. Ho H8.91 H: 9.87 OE. Ho: 29.87 9.87 H: 9.87 OF. Ho H