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Certain population of smokers

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In a certain population of smokers, the number of cigarettes smoked per day followed a fairly normal curve with a mean of 15 and a standard deviation of 6.

a. Use the 68-95-99.7 Rule to sketch a curve for this distribution, marking off the numbers of cigarettes smoked daily that are within 1, 2, and 3 standard deviations of the mean.

b. Explain why the lower end of the curve is not perfectly consistent with reality.

c. Find the z-score for a person who smokes one pack (20 cigarettes) a day.

d. Characterize one pack a day as being unusually low, unusually high, or not unusual.

e. Find the z-score for a person who smokes two packs a day.

f. Characterize two packs a day as being unusually low, unusually high, or not unusual.

Reference no: EM131816560

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