Question

Checkout times. The checkout times in minutes) for 12 randomly selected customers at a large supermarket during the store's busiest time are: 5.5 5.6 13.3 7.8 13.4 6.3 7.5 10.6 6.1 139 13. a. Find the mean of the checkout times (Type an integer or a decimal Round to two decimal places) b. Find the standard deviation of the checkout times mine (Type an integer or a decimal. Round to two decimal places)

Answer 1

Titel number of randomly sliced, austuvas (semples) N = 12 ( somhed The elements are :- 5.5 5.6 13.3 7.8 13.4 7.5 9.6 10.5 6.1 13.9 13.9 (a) Meon (if Sum of all somples Total number of samples = size of the sample Meen (A) = 5.5+ 5-6 +13.3 +7.8 +13.4+6-3 +7.5+9.6+10.5 +6.1+ 13-9+13.9 12 Mean (1) = 9.45 9.45 So the mean of the sample is (6) Standard duration gaien as, E (di - M)² is 6 6. (5-5-9-45) + (56-9-45) + (13-3-3-48) + (7-8--9-43)*+ (13-4-3-65) + (6.3-9.45)*+ (9-5-9:45)*+ (9.6 -9.45)° +(10:5-9-45) ? +(6:1-9:45) + (13.9-9:45) ? + (13-9 – 9:45)? 12 15.6 + 14.8+ 14.8 +27 + 15.6 + 9.9+ 3.8+ .02 + 11 + ll. 2 + 19.8 + 19.8 12 10.76 3.28 "This is a required a requied value of standard duration