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Question

You want to know the percentage of financial services companies that earned revenue between 27 million and 93 million dollars. If the mean revenue was 60 million dollars and the data has a standard deviation of 14 million, find the percentage. Assume that the distribution is normal. Round your answer to the nearest hundredth.

Answer 1

z = +/-33/14= about 2.357

by the empirical rule, over 95% are between 27 and 93 million, maybe about 96 or 97%

use z tables or a z calculator for a more accurate percentage