Question 4: In a normal distribution, with mean of 84 and standard deviation of 6, determine P(X > 75). Answer: Question 5: The personnel director of a large company studied the work habits of employees by dividing a selected group of employees to three seperate rooms: one room having only employees under the age of 40, another only with employees over the age of 40, and another with both age groups equally represented. These groups had to complete a collaborate task within two hours and their progress and success was recorded. The purpose of the study was to determine if employees over or under the age of 40 work more proficiently at collaborate activities. Is this study an observational study or an experiment