**The average number
of gallons of lemonade consumed by the football team during a game
is 20, with a standard deviation of 3 gallons. Assume that the variable
is normally distributed. When a game is played, find the probability
of using **

**a) Between 20 and
25 gallons**

b). Less than 19 gallons

c). More than 21 gallons

d). Between 26 and 28 gallons