Question

22. A standardized test has a mean of 500 and a standard deviation of 90. for randomly choosing a test score a. The probability is between 440 and 600. b. The 81st percentile is for this test. 23. Below are the percentages of registered voters who in a survey say that they support propositions A, B, and C. percent of the voters report that they do not support any of the propositions. A: 68% B: 64% C: 69% A and B: 45% A and C: 49% B and C 47% A, B, and C: 31 %

Answer 1

9 o solution :- el=500 22) a) PC 440 CXc 600) P 1 440-500 600 - 500 .) LZL go go &z=x-gy سے P(-0.67 276 1.10) Plac1-1) - plac-0.67) 0.8665 0.2514 0.6151 = 0.88 I-score for sist percentile (9 Z: x-mol =) 0.88 = X-500 go SS X 579.2 23) Plambos - 1-PC AUBUC) doo = 1 0.68+0.64 +0.69 -0.45-0.49 -0.47 2 to.31 11 1-po 0.4 6 18) 0.0995 xn Negative Bimonial 4 10-1 P(x=40 = (0.38)' 10.62) 4-1 12 19) P (x=5) p(x=5) = t