A study of water use in Gainesville, Florida, indicated that in 2006 residential water consumption had a

Question:

A study of water use in Gainesville, Florida, indicated that in 2006 residential water consumption had a mean of 78 and a standard deviation of 119, in thousands of gallons.
a. If the of water consumption were approximately normal, then what proportion of the residences used less than 100,000 gallons in 2006? (Assume negative infinity to 100 in calculating the proportion.)
b. In fact, the of water use was not actually normal. What shape do you expect the to have? Why?
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