For each problem, select the best response.
(a) The proportion of observations from standard Normal distribution that takes values less than z = 1.15 is about
A. 0.1251
B. 0.8749
C. 0.2436
D. 0.8531
E. None of the above.
(b) The proportion of observations from standard Normal distribution that take values larger than z = -0.75 is about
A. 0.7734
B. 0.3789
C. 0.2266
D. 0.8023
E. None of the above.
(c) The scores of adults on an IQ test are approximately Normal with mean 100 and standard deviation 15. Corinne has 118 on such test. She scores higher than what percent of all adults?
A. About 12%.
B. About 88%.
C. About 98%.
D. About 50%.
E. None of the above.