Reference no: EM132402391

In a certain population of smokers, the number of cigarettes smoked per day followed a fairly normal curve with a mean of 14 and a standard deviation of 6.

(a) If we 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. Report the 7 values that should be marked off in the sketch, in increasing order. 

1. (smallest value)  
2. (largest value) 

(b) What part of the curve cannot be perfectly consistent with reality? 

1. the lower end
2. the center
3. the higher end

(c) Find the z-score for a person who smokes one pack (20 cigarettes) a day. (Round your answer to two decimal places.)

(d) How would we characterize one pack a day in this distribution? 

1. unusually low
2. unusually high
3. not unusual

(e) Find the z-score for a person who smokes two packs (40 cigarettes) a day. (Round your answer to two decimal places.)

(f) How would we characterize two packs a day in this distribution? 

1. unusually low
2. unusually high
3. not unusual