Reading 9: Common Probability Distributions - LOS h, (Part standard

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Q1. The average annual rainfall amount in Yucutat, Alaska, is normally distributed with a mean of 150 inches and a standard deviation of 20 inches. The 90% confidence interval for the annual rainfall in Yucutat is closest to:

A)   117 to 183 inches.

B)   110 to 190 inches.

C)   137 to 163 inches.

Q2. The standard normal distribution is most completely described as a:

A)   distribution that exhibits zero skewness and no excess kurtosis.

B)   symmetrical distribution with a mean equal to its median.

C)   normal distribution with a mean of zero and a standard deviation of one.

Q3. Monthly sales of hot water heaters are approximately normally distributed with a mean of 21 and a standard deviation of 5. What is the probabilility of selling 12 hot water heaters or less next month?

A)   3.59%.

B)   1.80%.

C)   96.41%.

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