21. The weight of adult male grizzly bears living in the wild in the continental United States is approximately normally distributed with a mean of 500 pounds and a standard deviation of 50 pounds. The weight of adult female grizzly bears is approximately normally distributed with a mean of 300 pounds and a standard deviation of 40 pounds. Approximately, what would be the weight of a female grizzly bear with the same standardized score (2-score) as a male grizzly bear with a weight of 530 pounds? (A) 276 pounds (B) 324 pounds (C) 330 pounds (D) 340 pounds (E) 530 pounds 22. A random sample of 50 students at a large high school resulted in a 95 percent confidence interval for the mean number of hours of sleep per day of (6.73, 7.67). Which of the following statements best summarizes the meaning of this confidence interval? (A) About 95% of all random samples of 50 students from this population would result in a 95% confidence interval of (6.73, 7.67). (B) About 95% of all random samples of 50 students from this population would result in a 95% confidence interval that covered the population mean number of hours of sleep per day. (C) 95% of the students in the survey reported sleeping between 6.73 and 7.67 hours per day. (D) 95% of the students in this high school sleep between 6.73 and 7.67 hours per day. (E) A student selected at random from this population sleeps between 6.73 and 7.67 hours per day for 95% of the time. 23. The commuting time for a student to travel from home to a college campus is normally distributed with a mean of 30 minutes and a standard deviation of 5 minutes. If the student leaves home at 8:25 A.M., what is the probability that the student will arrive at the college campus later than 9 A.M.? (A) 0.16 (B) 0.32 (C) 0.50 (D) 0.84 (E) 1.00