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Analysing family's monthly gaoline purchases

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(TCO 6) The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.

(a) Find the probability that the family's monthly gaoline purchases will be between 88 and 98 gallons.
(b) Find the probability that the family's monthly gasoline purchases will be less than 100 gallons.
(c) Find the probability that the family's monthly gasoline purchases will be more than 78 gallons

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(TCO 6) The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
(a) Find the ...

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