Probability 30421

There are 25 students in the class, 12 of whom are not ready for math. There are five students in the math class. What is the probability of at least 3 being math ready?

Correct answer:

p =  0.4625

Step-by-step explanation:

p1=2512=0.48 q1=1p1=12512=251 252512=25252512=252512=2513=0.52  C3(5)=(35)=3!(53)!5!=2154=10  p3=(35) p13 q12=10 25123 251320.299 C4(5)=(45)=4!(54)!5!=15=5  p4=(45) p14 q11=5 25124 251310.138 C5(5)=(55)=5!(55)!5!=11=1  p5=(55) p15 q10=1 25125 251300.0255  p=p3+p4+p5=0.299+0.138+0.0255=0.4625

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