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Let x represent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned) shopping...

Let x represent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned) shopping interval. Based on a certain article, the mean of the x distribution is about $14 and the estimated standard deviation is about $5.

(b) What is the probability that x is between $12 and $16? (Round your answer to four decimal places.)

(c) Let us assume that x has a distribution that is approximately normal. What is the probability that x is between $12 and $16? (Round your answer to four decimal places.)

Math   Statistics-And-Probability   
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