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3. (15 points) Suppose the amount of heating oil used annually by households in Iowa is normally distributed with mean 200 gallons per household per
3. (15 points) Suppose the amount of heating oil used annually by households in Iowa is normally distributed with mean 200 gallons per household per year and a standard deviation of 40 gallons of heating oil per household per year. (a) (9 points) Find the probability of a randomly selected household in Iowa using more than 150 gallons of heating oil per year. A complete formula will sufce (b) (6 points) Is it. unusual for a household in Iowa to use 250 gallons of heating oil per year? Explain
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