PROBABILITY

The total amount being spent on personal calls in a month by employees of a company follows a
normal distribution with a mean of \$900 and a standard deviation of \$50. Find the probability that
in a randomly selected month the amount spent on personal calls is between \$775.00 and \$990.00.

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1. Z = (score - mean)/SD

Insert the values to find the two Z scores. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion between these Z scores.

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