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數學問題 唔該各位AR!!><

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1.At Nathan Road, the probability of having at most 5 accidents in a month is 0.28 and that of having 6 to 10 accidents in a month is 0.13. Find the probability that Nathan Road will have at most 10 accidents in a month. a. 0.85 b. 0.74 c. 0.59 d. 0.412) 2 cards are drawn randomly from a deck... 顯示更多 1.At Nathan Road, the probability of having at most 5 accidents in a month is 0.28 and that of having 6 to 10 accidents in a month is 0.13. Find the probability that Nathan Road will have at most 10 accidents in a month. a. 0.85 b. 0.74 c. 0.59 d. 0.41 2) 2 cards are drawn randomly from a deck of 52 cards without replacement. Consider A = 1, J = 11, Q = 12, K =13. The probability to get a sum of 25 is a. 1/169 b. 1/221 c. 2/169 d. 2/221 THX!

最佳解答:

1)P(Nathan Road will have at most 10 accidents in a month.)= P(having at most 5 accidents in a month) + P(having 6 to 10 accidents in a month)= 0.28 + 0.13= 0.41(d) 2) 25 = 13 + 12So P(to get a sum of 25)= P(to get a K and a Q)= (8/52) (4/52)= 2 / 169(c)

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