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The following is used for questions 7, 8 and 9. A study indicates that the weights of adults are normally distributed with a mean μ of 143 lbs and a standard deviation o of 29 lbs. 7. What is the probability that a randomly selected adult weighs between 128 and 155 lbs? (a) .3576 (b) .1591 (c) 1985 (d) .6985 (e) .2347 8. If 300 adults are randomly selected, how many will weigh more than 160 pounds. (a) 67 (b) .7224 (c) 300 (d) 150 (e) 83 9. Find a value of weight x such that only 15 % of adults weigh less than that. (a) 121.56 (b) 112.84 (c) 143 (d) 173.16 (e) 167.44 10. Which of the following statements are true about the sampling distribution of ? I. The mean of the sampling distribution is equal to the mean of the population. II. The standard deviation of the sampling distribution is equal to the population standard deviation divided by square root of the sample size. III. The shape of the sampling distribution is always approximately normal. (a) I only (b) II only (c) III only (d) I and II only (e) I and III only.