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Nordstrom conducted a study on the time its employees spent working besides regular store hours. The study showed that the employees spent an average of 1.2 hours working with a standard deviation of 0.40 hours and it follows the normal probability distribution. explain how answer was achieved
(a) Find the portion of the employees who spent between1.2 and 2 hours besides regular store hours.
μ= 1.2 ?= 0.40
z= = (b) Find the portion of the students who spent more than 2 hours besides regular store hours. (c) Find the portion of the students who spent between 2 and 2.2hours to besides regular store hours. (d) Find the portion of the students who spent between 1 and 2.2 hours besides regular store hours.
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