EC315 Quiz Help 3

# EC315 Quiz Help 3 - Chapter 7 Continuous Probability...

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Chapter 7 Continuous Probability Distributions Multiple Choice 38. The mean of any uniform probability distribution is A) (b - a)/2 B) (a + b)/2 C) Σ x/η D) n π Answer: B 44. Which of the following is NOT true regarding the normal distribution? A) Mean, median and mode are all equal B) It has a single peak C) It is symmetrical D) The points of the curve meet the X-axis at z = –3 and z = 3 Answer: D 46. For a standard normal distribution, what is the probability that z is greater than 1.75? A) 0.0401 B) 0.0459 C) 0.4599 D) 0.9599 Answer: A 47. What is the area under the normal curve between z = 0.0 and z = 1.79? A) 0.4633 B) 0.0367 C) 0.9599 D) 0.0401 Answer: A 48. What is the area under the normal curve between z = –1.0 and z = –2.0? A) 0.0228 B) 0.3413 C) 0.1359 D) 0.4772 Answer: C 49. What is the area under the normal curve between z = 0.0 and z = 2.0? A) 1.0000 B) 0.7408 C) 0.1359 D) 0.4772 Answer: D 50. The mean amount spent by a family of four on food per month is \$500 with a standard deviation of \$75. Assuming that the food costs are normally distributed, what is the probability that a family spends less than \$410 per month? A) 0.2158 B) 0.8750 C) 0.0362 D) 0.1151

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