by ss that 10% of find the that r, a class of 20 stores. 2 peoe re worn c Unifor

Question

by ss that 10% of find the that r, a class of 20 stores. 2 peoe re worn c Uniform d. Norma The CO emssons produced by afanity of 16"gres asmeavedorastanarsad,et. normaly distributed with a mean of 120 pom and a standard deviarion of 12com hat pecetage of engines will produce Co emissions greater than 135ppm a. 39.44% b. 10.56% c. 60.56% d. 15.44% e. None of the above In a gambling game, on every play, there is a 01 probability that you win $7 and a 0s probabity that you lose $1. What is the expected value of this game? a +52 b. $0.20 d. $0.20 e. None of the above

Explanation / Answer

5)

Z score at x=55

Z = (X - ) /
Z = (55 - 50) / 5

Z = 1

P value at z=1

P(X<55)= 0.8413

Option C 84% is correct

6)

a) Binomial distribution

7)

Z = (X - ) /
Z = (135 - 120) / 12

Z = 1.25

P value at z=1.25

P( X>135)= 0.1056

option b 10.56%

8)

expected value = xP(x)= 0.1(7)+0.9(-1)=0.7-0.9=-0.2

Option B $0.20

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