標題:
Probability Mc
發問:
1)In a class of 45 students with 30 boys, tow students are selected at ramdom to take part in a debate contest. If one of the representatives must be the boy monitor, find the probability that the other one is also a boyA. 29/44B. 41/44C. 15/22D. 2/32)A fair coin is tossed 3 times. What is the... 顯示更多 1)In a class of 45 students with 30 boys, tow students are selected at ramdom to take part in a debate contest. If one of the representatives must be the boy monitor, find the probability that the other one is also a boy A. 29/44 B. 41/44 C. 15/22 D. 2/3 2)A fair coin is tossed 3 times. What is the probability that the last toss is a head given that two of the tosses are heads? A. 1/2 B. 1/3 C. 1/4 D. 2/3
最佳解答:
1. A,因為得29個BOY有可能(30BOY-1), 而全部既可能性係44個人(45-1) 2.coin有2面, 1面公,1面字,我當公係1,字係2 佢toss3次, 機會就係 1-1-1, 1-1-2 咁而家有2面係head而最後都係head既機會有1個,就係1-1-1 所以ans=A, 1/2
其他解答:
Probability Mc
發問:
1)In a class of 45 students with 30 boys, tow students are selected at ramdom to take part in a debate contest. If one of the representatives must be the boy monitor, find the probability that the other one is also a boyA. 29/44B. 41/44C. 15/22D. 2/32)A fair coin is tossed 3 times. What is the... 顯示更多 1)In a class of 45 students with 30 boys, tow students are selected at ramdom to take part in a debate contest. If one of the representatives must be the boy monitor, find the probability that the other one is also a boy A. 29/44 B. 41/44 C. 15/22 D. 2/3 2)A fair coin is tossed 3 times. What is the probability that the last toss is a head given that two of the tosses are heads? A. 1/2 B. 1/3 C. 1/4 D. 2/3
最佳解答:
1. A,因為得29個BOY有可能(30BOY-1), 而全部既可能性係44個人(45-1) 2.coin有2面, 1面公,1面字,我當公係1,字係2 佢toss3次, 機會就係 1-1-1, 1-1-2 咁而家有2面係head而最後都係head既機會有1個,就係1-1-1 所以ans=A, 1/2
其他解答:
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