number 21 2 square feet and the variable is normally D. Shook and Robert L Shook

Question

number 21

2 square feet and the variable is normally D. Shook and Robert L Shook. The Book of Odds is $246,300 with a standard deviation of school, what is to stay out of thi e Prices If the average price of a new one- 27. Product Market market a produ that for a partic is $24,596 and company plar based on ince variable is n family n tind the minimum and maximum prices of the s that a contractor will build to satisfy the middle houser the market. Assume that the variable is normally New York Times Almanoc st of Personal Computers The average price of a person roximately normally distributed and = $100, t is the probability that a randomly selected PC costs more than S 1200? The least expensive 10% of per- 28. Bottled 21.- nal computer (PC) is $949. If the computer prices age of 34 If the sta is norm domly bottle computers cost less than what amount? sonal S New ork Ties Aluna 22 Reading Improvement Program To help students 29. Wr improve their reading, a school district decides to imple- nent a reading program. It is to be administered to the in the district, based on the

Explanation / Answer

21) mean = 246300

Sd = 15000

1 - 0.8 = 0.2

1 - 0.2/2 = 0.9

P(X < max) = 0.9

Or, P(Z < (max - 246300)/15000) = 0.9

Or, (max - 246300)/15000 = 1.28

Or, max = 246300 + 1.28 * 15000 = 265500

Similarly for minimum,

P(X < min) = 0.1

Or, min = 246300 - 1.28 * 15000 = 227100

So, maximum value is 265500 and minimum value is 227100

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