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adalei:
A national restaurant chain claims that their servers make an average of $12.85 in tips per hour, with a standard deviation of $2.15. The servers at the restaurant chain's location in Dallas make an average of $8.65 in tips per hour. Given that the data is approximately normal, find the probability that a server, chosen at random, will make more than $8.65 in tips per hour.
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Vocaloid:
Calculate the z score (Dallas tips - national average)/standard dev Then use a z table to find the associated probability. This will give you the probability of making less than 8.65 so just take 1 - the result to get the probability of getting greater than 8.65
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