2 points d approximate the probability that the

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Unformatted text preview: 2 points. (d) Approximate the probability that the average test score in the smaller class exceeds that of the other class by over 2.2 points. X ~ N (74,14 / n ) 80 − 74 ) = .016 14 / 5 80 − 74 (b) P( X > 80) = P( Z > ) = .0003 14 / 8 (a ) P( X > 80) = P( Z > 14 2 14 2 (c)Y = X 64 − X 25 ~ N (0, + ) 64 25 2.2 − 0 P(Y > 2.2) = P( Z > ) = .25 3.3 2.2 − 0 (d ) P(Y < −2.2) = P( Z < − ) = .25 3.3 2. A ski lift is designed with a total load limit of 10,000 pounds. It claims a capacity of 50 persons. An expert in ski lifts thinks that the weights of all the people using the lift have...
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