Probability 40131

There are 28 students in the IK3 class. Three pupils will be examined. Nineteen pupils are ready for the exam. What is the probability that all three will be unprepared?

Correct answer:

p =  0.0256

Step-by-step explanation:

n=28 N=n19=2819=9  p=nN n1N1 n2N2=289 28191 28292=391=0.0256

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Showing 2 comments:
Math student
This is incorrect as it assumes a constant probability as the kids are chosen. The answer would be 9/28 * 8/27 * 7/26 OR 9C3 / 28C3.

Hello, we corrected this

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