(a) The scores of adults on an IQ test are approximately Normalwith mean 100 and standard deviation 15. The organization MENSA,which calls itself 'the high IQ society', requires an IQ score of130 or higher for membership. About what percent of adults wouldqualify for membership?

A. 67%
B. 2.5%
C. 95%
D. 5%
E. None of the above.

(b) The scores of adults on an IQ test are approximately Normalwith mean 100 and standard deviation 15. Corinne has 118 on suchtest. She scores higher than what percent of alladults?

A. About 12%.
B. About 50%.
C. About 88%.
D. About 98%.
E. None of the above.

(c) The proportion of observations from standard Normaldistribution that take values larger than z = -0.75 isabout

A. 0.3789
B. 0.8023
C. 0.7734
D. 0.2266
E. None of the above.

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Answer 1 General guidance Concepts and reason Normal distribution Normal distribution is a continuou... View the full answer