introduction to probability A

ShikaP

2011-03-18 5:37 am

(oxford /canotta maths WB3A)
2. in each of the following, find
(i)the total num. of possible outcomes
(ii)the num. of outcomes favourable to the event,
(iii)the probability of the event

(a)A dice is thrown.A number greater than 4 is obtained
(b)A card is drawn at random from a pack of playing cards.The card drawn is a heart.
(c)A bag contains 8balls of the same size, 3of them are red,4 are yellow and 1 is white.A ball is randomly drawn and a red ball is obtained.
(d)A letter is chosen at random from the letters of the word "ASSESSMENT".The letter "S" is obtained
(e)There are 30num.from 1~30.A num is selected at random,which get a multiple of 3 .

回答 (1)

用戶9112

2011-03-18 6:35 am

✔ 最佳答案

(a)(i) 6 possible outcomes(ii) 2 favourable outcomes, i.e.5 or 6(iii)Probability=2/6=1/3(b) (i) 52 possible outcomes(ii)13 favourable outcomes(iii)Probability=13/52=1/4(c) (i)8 possible outcomes(ii)3 favourable outcomes(iii)Probability=3/8(d)(i) 10 possible outcomes(ii)4 favourable outcomes(iii)Probability=4/10=2/5(e)(i)30 possible outcomes(ii)10 favourable outcomes, i.e.3,6,9,12,15,18,21,24,27,30(iii)Probability=10/30=1/3

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