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工作学习 / 求学深造 / Haley's Manufacturing makes fishing reels. Unfortunately, 3% of the reels are defective. Haley's has just received and order for 800 reels from massey Sporting Goods.
Do u know how to do the following questions?
-farmer(农夫);
2001-10-1{149}(#214328@0)
a) What is the probability that more than 25 reels are defective?
b) What is the probabilty that between 15 adn 20 reels (inclusive) are defective?
Try to find a Basic Statistics book to get some formula.
-april(霏);
2001-10-1{169}(#214350@0)
In a bell shape, the middle point is 24 (=800X3%). With the formula, calculate the the value of one standard deviation, and then you can get the probabilities you need.