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25. The weights of the eggs produced by a certain breed of hen are normally distributed with mean 65 grams and standard deviation of 5 grams, Which of the following will you use? A. Normal Distribution C. Central Limit Theorem 8. Discrete Probability Distribution D. Binomial Distribution 26. In a study done on the life expectancy of 500 people in a certain geographic region, the mean age at death was 72 years and the standard deviation was 5.3 years. If a sample of 50 people from this region is selected, and the probability that the mean life expectancy will be less than 70 years, which of the following will you use? A. Normal Distribution C. Central Limit Theorem 8, Discrete Probability Distribution D. Binomial Distribution 27. Suppose the teenagers that attend public high schools get an average of 5.7 hours of sleep each night with a standard deviation of 1.7 hours, Assume that the average sleep hour is normally distributed, and 35 high school students are randomly selected, Compute the z-score for 6 hours of sleep. A. 1.04 B. 0.18 C. 0.52 D. 0.82 28. Suppose the teenagers that attend public high schools get an average of 5.7 hours of sleep each night with a standard deviation of 1.7 hours. Assume that the average sleep hour is normally distributed, and 35 high school students are randomly selected. What is the probability that a randomly selected group of 35 high school students gets more than 6 hours of sleep each night? A. 0.3508 B. 0.1492 C. 0.0714 D. 0,4286 29. What will be the degree of freedom of the data whose sample size is 18? A. 17 B. 18 C. 19 D. 20 30. Researchers found that boys playing high school football recorded an average of 355 hits to the head with a standard deviation of 80 hits during a season. What is the probability on a randomly selected team of 48 players that the average number of head hits per player is between 340 and 360? A. 56.96% B. 43.0426 C. 40.32% D. 16.64% 31. Which of the following is NOT a characteristics of t-distribution? A. Like the normal distribution, the t-distribution has a smooth shape. B. Like the normal distribution, the t-distribution is symmetric. If you think about folding it in half at the mean, each side will be the same. C. Like a standard normal distribution (or z-distribution), the tdistribution has a mean of one. D. The normal distribution assumes that the population standard deviation is known. The t-distribution does not make this assumption. 32. If three coins are tossed, which is NOT a possible value of the random variable for the number of tails? A. 1 B. 2 C. 3 D. 4 33. Which of the following is a discrete random variable? A. Length of electrical wires C. Number of pencils in a box B. Amount of sugar used in a cup of coffee D. Voltage of car batteries 34. It is a numerical quantity that is assigned to the outcome of an experiment. A. random variable B. variable C. probability D. probability distribution 35. What will be the degree of freedom whose t-value is 0.6897 A. 1 B. 2 C.3 D. 4
