26) Suppoce we want to tet the claim that lese than h of Amexicans are In favor

Question

26) Suppoce we want to tet the claim that lese than h of Amexicans are In favor of raladng the26) voting age to 21. Io the hypotheala teot left-talled, right-talled, or two-talled? B) Two-tailed Right-talled A) Left-talled 27) Assume that #coreo are nomally distributed with a mean of 0 and astandard deviation of 1 If 27) P-aKzca)-0.4314, find a A)-0.18 B) 0.57 C)0.3328 D) 149 28) On a test, 74% of the questions are arowered correctly. Till questions are correct, how many 28)- - quectione are on the teat? A) 150 questlions C) 82 quetions B) 37 quections D) 67 questions 29) The manager of a bank recorded the amount of tume each customer apent walting in line during 29) peak businece hours one Monday. The frequency table below cummarizes the resulte Waiting Time Number of (minutes) 0-3 Customers 12 8-11 12-15 16-19 20-23 0

Explanation / Answer

solution:-

26. solution:- option B. 0.57
P(-a < z < a) = 0.4314
(0.4314)/2 = 0.2157
0.2157 is area to the right of the mean
and 0.2157 is area to the left of the mean
That leaves a left tail of 0.5-0.2157 = 0.2843
Find the z-value with a left-tail of 0.2843
-a = -0.57
then a = 0.57

28. solution:- option A. 150 questions
111 = 0.74x
x = 111/0.74
= 150 total questions

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