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