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Unformatted text preview: n 2.00 and 2.50 ounces? A. .500 B. .905 C. .9525 D. .9544 135. An apple juice producer buys all his apples from a conglomerate of apple growers in one northwest state. The amount of juice squeezed from each of these apples is approximately normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounce. What is the probability that a randomly selected apple will contain more that 2.50 ounces? A. .9525 B. .4525 C. .0475 D. .5474 1-467 Chapter 01 - An Introduction to Business Statistics 136. An apple juice producer buys all his apples from a conglomerate of apple growers in one northwest state. The amount of juice squeezed from each of these apples is approximately normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounce. 77% of the apples will contain at least how many ounces of juice? A. 2.12 B. 2.38 C. 2.36 D. 2.14 137. An apple juice producer buys all his apples from a conglomerate of apple growers in one northwest state. The amount of juice squeezed from each of these apples is approximately normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounce. Between what two values (in ounces) symmetrically distributed around the population mean will 80% of the apples fall? A. [2.13 2.37] B. [2.10 2.40] C. [2.06 2.44] D. [1.95 2.55] 138. Find z when the area between 0 and z is .4750 A. -1.96 B. 1.96 C. 0.68 D. -0.68 139. Find z when the area to the right of z is .1314 A. 1.12 B. 0.55 C. -0.55 D. -1.12 1-468 Chapter 01 - An Introduction to Business Statistics 140. Find z when the area to the left of z is .6700 A. 0.75 B. 0.44 C. -0.44 D. -0.75 141. Find z when the area between z and - z is .9030 A. 1.50 B. 1.30 C. 0.12 D. 1.66 142. Find z when the area to the left of z is .05 A. 1.645 B. 1.00 C. -1.645 D. -1.96 143. A paint sprayer coats a metal surface with a layer of paint between 0.43 and 1.23 millimeters thick. The thickness of the coat of paint is approximately uniformly distributed. What is the standard deviation of the thickness of the coat of paint on the metal surface? A. .83 B. .23 C. .48 D. .40 144. A paint sprayer coats a metal surface with a layer of paint between 0.43 and 1.23 millimeters thick. The thickness of the coat of paint is approximately uniformly distributed. What is the probability that paint from this sprayer on any given metal surface will be between 0.75 and 1.05 millimeters thick? A. .375 B. .181 C. .854 D. .610 1-469 Chapter 01 - An Introduction to Business Statistics 145. The yearly cost of dental claims for the employees of the local shoe manufacturing company is normally distributed with a mean of $105 and a standard deviation of $35. What is the yearly cost at which 35% of the employees fall at or below? A. $118.48 B. $127.29 C. $82.71 D. $91.53 146. A plant manager knows that the number of boxes of supplies received weekly is normally distributed with a mean of 200 and a standard deviation of 20. What percentage of the time will the number of boxes received weekly be greater than 200 A. 100% B. 25% C. 0% D. 50% 147. A plant manager knows that the number of boxes of supplies received weekly is normally distributed with a mean of 200 and a standard deviation of 20. What percentage of the time will the number of boxes received weekly be less than 160? A. 2.28% B. 57.93% C. 42.07% D. 4.56% 148. A plant manager knows that the number of boxes of supplies received weekly is normally distributed with a mean of 200 and a standard deviation of 20. What percentage of the time will the number of boxes received weekly be between 180 and 210? A. .6915 B. .1915 C. .5328 D. .1587 1-470 Chapter 01 - An Introduction to Business Statistics 149. A plant manager knows that the number of boxes of supplies received weekly is normally distributed with a mean of 200 and a standard deviation of 20. What percentage of the time will the number of boxes received weekly be greater than 210 or Less than 180? A. .6915 B. .4672 C. .1915 D. .1587 150. Suppose the distribution of personal daily water usage in New York City is normally distributed with a mean of 15 gallons and a variance of 25 gallons. Because of a current problem with the distribution of water to its citizens, the mayor wants to give a city tax rebate to the 15 percent of the population who use the least amount of water. What should he use as the water limit for a person to qualify for a city tax rebate? A. 9.825 B. 15.00 C. 12.20 D. 10.25 1-471 Chapter 01 - An Introduction to Business Statistics Chapter 06 Continuous Random Variables Answer Key True / False Questions 1. A uniform distribution f(x) is a continuous probability distribution which says the probability that x is in any 2 intervals of equal length is the same. TRUE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Medium Topic: Uniform Distribution 2. The mean and median are the same for a normal distribution. TRUE AACSB: Reflective Thinking Bloom's: Knowledge Difficulty: Easy Topic: Normal Distribution 1-472...
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This document was uploaded on 01/20/2014.

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