statistics

' _ .... _ . . nu...- lm-'u:_' - . ' I.._u_._._".w ._ D. Question 13 2 pts ' | The average time it takes a group of adults to complete a certain ;' achievement test is 42.6 minutes The standard deviation is 8 minutes. ' Assume the variable is normally distributed. Please show the following : answers to 4 decimal places. I the test in less than 40 minutes? I il a] What is the probability that one randomly selected adult will complete F I b) What is the probabi Iitv that a sample of 50 adults will complete the test with an average time less than 40 minutes? _ I '-: .s' r