questions are from statistics and I need accurate answers for the given parts.. please give me right answer and don't need to waste my question with wrong solution. You can get thumb up or down on your work..

QUESTION 18 The following data represent the number of pieces of mail received at ZU for one week 54 55 97 99 110 87 93 Find the coefficient of variation for these data. O 35.14% O 27.51% O 44.55 O 25.84% QUESTION 19 4 Ahmed scored 80 marks on a test. The mean score of the class was 56 with a standard deviation of 13. Calculate the z score for the marks secured by Ahmed. Round your answer to two decimal places