花老野

幫解答一下 以下問題
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1. Abe, Bernadette, and Chris toss a coin one after another. The first one to throw a head wins the game. What are the respective chances of Abe, Bernadette, and Chris winning the game?

答案係 Abe=0.5714 Bernadette=0.2857, Chris=0.1429

2. A survey taken of 200 indivuals to ascertain whether they undertook regular exercise obtained the following results:

Under 50 years of age :
Exercises regularly 55
Does not exercise 40

50 years of age and over:
Exercises regulaly 20
Does not exercise 85

find the probability that given that a person does not exercise they are under 50 years of age

答案係0.32


答案係本書抄出黎,我想要步驟

[ 本帖最後由 花老野 於 2011-11-2 15:36 編輯 ]

花老野

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