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The amount of tar contents in domestic cigarette brands varies normally with an average of 15.60...

The amount of tar contents in domestic cigarette brands varies normally with an average of 15.60 mg and a standard deviation of 4.97 mg. What proportion of cigarettes have between 11.97 mg of tar and 25.2 mg of tar?

a) 0.4750

b) 0.2295

c) 0.1667

d) 0.7407

Math   Statistics-And-Probability   
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