標題:
Probability Maths F.5 .
發問:
9 men and 7 women apply for a temporary job at the same time. If 2 persons are selected for an interview at random from these applicants,find the probability , 1. At least one of the selected pweson is a woman. ans 7/10The letters in the word''TABLE'' are arranged at random into different... 顯示更多 9 men and 7 women apply for a temporary job at the same time. If 2 persons are selected for an interview at random from these applicants,find the probability , 1. At least one of the selected pweson is a woman. ans 7/10 The letters in the word''TABLE'' are arranged at random into different ordered Find the probability that the first letter is T. ans 1/5 3.A number is selected at random from all two-digit numbers. Find probability of 1. the number selected is smaaler than 40 ans:1/3 2.the number selected is multiple of 10 ans:1/10 3.the number selected is smaller than 30 or a multiple of 10 ans :2/5 Ther are 200 apples in abox, 120 are red apples , 80 are green apples . 6 of the red apples are rotten and 8 of the green apples are rotten. If an apple is taken at random forom the box. Find probability of 1. It is a green apple or rotten . ans : 43/100
最佳解答:
1. Required probability = (7/16)(9/15)(2) + (7/16)(6/15) = 7/10 2. Required probability = 4!/5! = 1/5 3a. Required probability = 30/90 = 1/3 b. Required probability = 10/90 = 1/9 c. 係咪打錯字?細過40? Required probability = 30/90 + 6/90 = 2/5 4. Required probability = (80+6)/200 = 43/100
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