1) The average time to handle a call at the Call-No-wait call processing center has a specification of 61.25 minutes. The loss resulting from a mishandled call is $15. A sample of 25 calls was drawn from the process and the results, in minutes, are as follows:6.5,6,6.5,5,5.5,7.3,6.6,6.2,4.3,6.7,5.5,4.8,7.2,6.9,6.4,5.1,5.6,7.4,6.1,6.3,5.9,7.1,4.6,4.7,6.2a) What are the sample mean and sample variance?