A sample of university students has an average GPA of 2.78 with a standard deviation of 0.45. If GPA is normally distributed, what percentage of the students has GPAs (use Appendix B in your book. You will need to determine which column you need to use)     Z score a. less than 3.80   b. more than 3.78   c. less than 2.50

Psychology students at a university completed the Dental Anxiety Scale questionnaire. Scores on the scale range from 0 (no anxiety) to 20 (extreme anxiety). The mean score was 11 and the standard deviation was 3.5. Assume that the distribution of all scores on the Dental Anxiety Scale is normal with u = 11 and o = 3.5. Complete parts a through c. Click here to view a table of areas under the standardized normal curve. a. Suppose you score a 18 on the Dental Anxiety Scale. Find the z-value for this score. z= 2 (Round to the nearest hundredth as needed.) b. Find the probability that someone scores between 10 and 15 on the Dental Anxiety Scale. P(10sxs 15) = (Round to four decimal places as needed.) c. Find the probability that someone scores above 17 on the Dental Anxiety Scale. P(x> 17) =| (Round to four decimal places as needed.)

The body temperatures of adults are normally distributed with a mean of 98.6° F and a standard deviation of 0.27° F. What temperature represents the 95th percentile? Click to view page 1 of the table. Click to view page 2 of the table. OA. 99.04° F OB. 98.95° F OC. 98.16° F O D. 99.13° F C

Many college admissions want to know your class percentage in addition to your grades.  The grades are normally distributed.  A certain university insists that a student place in at the 90th percentile.  if the mean is 79.45 and the standard deviation is 5.37, what is the 90th percentile? a.88.07 b.85.01 c.86.33 d.90