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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

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)

Jun 14 2020 View more View Less