Unformatted text preview: Dre? a. 10% b. 90% c. 97.72% d. 2.28% e. None of the above 4. Select one student at random from Bob’s class. What is the chance that his/her score will be higher than 78? (Show all work and put your final answer in the blank.) z = (78 – 80)/5 =  .40 1.3446 = .6554 ANS 65.54% 5. Take a random sample of 49 students from Bob’s class and find their average score. What is the chance that their average score will be higher than 78? (Show all work and put your final answer in the blank.) 1 – P(xbar < 78) = 1 – P(z < (7880)/(5/7)) = 1 – P(z < 2.8) = 1  .0026 = .9974 ANS 99.74%...
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This note was uploaded on 02/16/2010 for the course STAT 133 taught by Professor Rumseyjohnson during the Fall '07 term at Ohio State.
 Fall '07
 rumseyjohnson

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