7a) On a standard measure of hearing ability, the mean is 300 and the standard deviation is 20. Give the proportion of people who score less than 310.

7b) On a standard measure of hearing ability, the mean is 300 and the standard deviation is 20. Give the proportion of people who score less than 260.

8a) On a measure of artistic ability, the mean for college students in New Zealand is 150 and the standard deviation is 25. Give the raw score for persons whose Z score on this test is -.8.

8b)On a measure of artistic ability,the mean for college students in New Zealand is150and the standard deviation is25.Give the raw score for persons whose Z score on this test is1.38.