15. A box plot is drawn using a 12-inch ruler as the scale. The box extends from 3.5 in. to 6.0 in. Which of the following represents the upper boundary for outliers (that is, the smallest value beyond which you will find outliers)? A. 7.25 in. B. 10.5 in. C. 9.75 in. D. 6 in. E. 3.75 in 16. Consider a set of 7500 scores on a national test whose score is known to be distributed normally with a mean of 510 and a standard deviation of 85. About how many scores greater than 600 would we expect to find? A. 3750 B. 2664 C. 6414 D. 575 E. 1086 17. Which of the following is always true of a normal distribution? It extends exactly three standard deviations in each direction from the mean. II. The mean equals the median, which equals the mode. Ill. An interval one standard deviation wide centered at the mean has more area under the curve than an interva standard deviation wide centered at a value to the right of the mean. A. II and Ill only B. I and Ill only C. I only D. II only E. I, II, III 18. A group of professional wrestlers are known to have weights that are normally distributed with a mean of 265 lbs. and a standard deviation of 28 lbs. To the nearest pound, what is the least amo one of these wrestlers could weigh and still be in the top 10% of all weights? A. 297 lbs. B. 298 lbs. C. 299 lbs. D. 300 lbs. E. 301 lbs