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Z Distrbution Quiz 1 (7 MCQs)

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1. The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.About what percent of the products last 8 days or more?
2. Find the cumulative area that corresponds to a z-score of 1.25.
3. In a survey of men in the United States (ages 20-29), the mean height was 69.6 inches with a standard deviation of 3.0 inches. Find the minimum height in the top 22%.
4. The monthly phone bills in a city are normally distributed with a mean of 30$ and a standard deviation of 12$ . Find the x-value that correspond to z-scores of 3.17.
5. If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall?
6. The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees. Approximately what percent of days in February will have days below 21 degrees? Choose the closest answer.
7. Using a z-score table. Fernando is 60 inches tall. The average height for his age and gender is 68 with a standard deviation of 10 inches. What percent of his peers are shorter than him?

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