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Recent research suggests that Americans make an average of 10 phone calls per day (CNN, August 26, 2010) Let the number of calls be normally distributed with a standard deviation of 3 calls Use Table 1
aWhat is the probability that an average American makes between 4 and 12 calls per day? (Round “z” value to 2 decimal places and final answer to 4 decimal places)
bWhat is the probability that an average American makes more than 6 calls per day? (Round “z” value to 2 decimal places and final answer to 4 decimal places)
cWhat is the probability that an average American makes more than 16 calls per day? (Round “z” value to 2 decimal places and final answer to 4 decimal places)
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