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During a certain week the mean price of gasoline in New York City was $3.75 per...

During a certain week the mean price of gasoline in New York City was $3.75 per gallon with the standard deviation of $0.43. Assume the variable is normally distributed.

A) If a gas station is randomly selected from this city what is the probability that the price is less than $3.89 that week? Write your answers with four decimal places.

B) If a gas station is randomly selected from this city what is the probability that the price is more than $2.81 that week?

C) If a sample of 40 gas stations is randomly selected from this city what is the probability that the mean price for the sample was between $3.57 and $3.80 that week?

Math   Statistics-And-Probability   
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