Using the CASIO fx-9750GII calculator, and NOT using the Z-score
formula, please answer the following question, show your work, and
explain how you got each part of your answer. A firm’s marketing
manager believes that total sales for next year can be represented
by a normal distribution, with a mean of $2.5 million and a
standard deviation of $300,000. The firm has fixed costs of $1.8
million. What is the probability that the firm’s sales will be
within $150,000 of the expected (i.e., mean) sales?
