close

標題:

about probability(urgent!!!10)

發問:

The programmes offered by a community college are open to all enrollments without any special entrance requirement. Past records indicate that 7 out of 10 of the participants would drop out before completing the enrolled programmes.Twenty participants are randomly selected from the list of all enrolled... 顯示更多 The programmes offered by a community college are open to all enrollments without any special entrance requirement. Past records indicate that 7 out of 10 of the participants would drop out before completing the enrolled programmes.Twenty participants are randomly selected from the list of all enrolled participants.What is the probability that : (a)exactly 5 out of these 20 participants would complete their enrolled programmes in the college? (b)10 or more of these 20 paricipants would complete their enrolled programmes in the college? (show all workings and correct to 3 decimal places in your answers.)

aa.jpg

 

此文章來自奇摩知識+如有不便請留言告知

最佳解答:

(a) Combination: nCr = 20C5 = 15504 P(complete) = 3/10 P(incomplete) = 7/10 (3/10)^5 x (7/10)^15 x nCr =0.00243 x 0.004747561 x 15504 =0.1789 (b) Combination: nCr = 20C10 184756 =(3/10)^10 x (7/10)^10 x nCr =0.0308

其他解答:

arrow
arrow
    文章標籤
    火影忍者 更多 平機票 解總係 西甲
    全站熱搜
    創作者介紹
    創作者 oob73zj92b 的頭像
    oob73zj92b

    oob73zj92b的部落格

    oob73zj92b 發表在 痞客邦 留言(0) 人氣()

    E-mail轉寄