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OpenStudy (anonymous):
Jen's monthly phone bill is normally distributed with a mean of $55 and a standard deviation of $8. In what interval would you expect the central 95% of bills to be found? A) 47 - 63 B) 39 - 71 C) 31 - 79 D) 23 - 87
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OpenStudy (anonymous):
B) 39 - 71 Apply empirical rule 95% is within 2 standard deviations.
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