please solve it in 20 mins I will thumb you up

Question 1 The manager of a bank branch would like to improve the customer satisfaction index of his branch. A survey has been conducted on 15 customers who have visited to this branch on a particular period of time. The survey results are recorded in the table below: 7.3 7.8 6.9 6.8 8.4 9.1 7.5 0010 8.3 8.7 7.6 7.9 7.4 8.2 8.4 7.7. Question 1 a) - Find the mean of the above data set. (Give your answer correct to four decimal places) * Your answer Question 1 b) - Find the mode of the above data set. * Your answer Your answer Question 1 c) - Find the coefficient of variation for the customer satisfaction index of this bank branch. Give your answer in percentage form with two decimal places