1. Suppose a normal distribution has a mean of 12 and a standard deviation of 4.
A value of 18 is how many standard deviations away from the mean?
A.-2
B.-1.5
C. 1.5
D. 2
2. Suppose the number of dropped footballs for a wide receiver, over the course of a season, are normally distributed with a mean of 16 and a standard deviation of 2.
What is the z-score for a wide receiver who dropped 13 footballs over the course of a season?
A.-3
B.-1.5
C. 1.5
D. 3
3. Suppose the number of gallons of gasoline per day used by a car is normally distributed with a mean of 2.2 gallons and a standard deviation of 1.2 gallons.
What is the difference in gallons per day used by a car with a z-score of 3 and another car that has a z-score of 0?
A. 1.2
B. 2.6
C. 3.6
D. 4.6
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