9. What is the probability that only 1 selected students are com 4) 0.0747 secti
ID: 3365373 • Letter: 9
Question
9. What is the probability that only 1 selected students are com 4) 0.0747 section? ents are coming from the 1st 1) 0.2517 2) 0.2885 5) 0.2098 3) 0.3200 4) 0.1632 Q10. What is the probability that no more than tima 1) 0.2418 2 students are from the 2nd section? 5) 0.2867 3) 0.4126 4) 0.3427 2) 0.2054 A pediatrician wishes to recruit 3 cou participate in a new natural childbirth-treatment. Letpe ples, each of whom is expecting their first child, to couple agrees to participate). 23% (a randomly selected 018 Ql1. What is the probability that 10 couples must be asked before 3 are foun d who agree to participate? 1) 0.0751 2) 0.0703 3) 0.0783 4) 0.0640 5) 0.0799 To esti 012. What is the probability that he need to ask more than 4 couples before 3 are with 1 Q1 found who agree to participate? 1) 0.9688 2) 0.9237 3) 0.9492 5) 0.9372 4) 0.9597 Q13. What is the probability that a randomly selected adult whose height is lower 3) 0.0649 Adult human heights are normally distributed with -65 inches and SD-31 inches. than 60 inches. 1) 0.0534 2) 0.0591 5) 0.0707 4) 0.0766 Q14. What is the cutoffpoint of the upper 30% with the lower 70% of the population? To 1) 66.6781 2) 66.7305 3) 66.8354 5) 66.6256 4) 66.7830Explanation / Answer
Q11) p = 0.23
P(10 couples must be asked before finding 3) = P(2 out of first 9 agreed) x P(10th couple agreed)
= 9C2 x 0.232 x (1-0.23)7 x 0.23
= 0.0703
Q12) P(she need to ask more than 4 couples to find 3 who agree) = 1 - P(first 4 agreed) - P(3 of 3 out of 4 agreed)
= 1 - 0.234 - 4C3x0.233x0.77
= 1 - 0.0028 - 0.0375
= 0.9597
P.S - Please post different questions separately
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