Hi, There is a mistake in the calculations in the question about the conditional probabilities (question 3- drawing a boy's name). This carries out the same mistake in question 4. The correct result for question 3 is 18/25 and not 24/35. In the following question, a student needs to use this result to calculate the next result which results in an answer that doesn't appear in the possibilities. It is very easy to see that there is an error in the calculation, not in how they formulated the answer.

The answer seems to have been updated now. It's actually 18/35, not 18/25 - I assume you made a typo.

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Last answered:

22 Jan 2022

Posted on:

20 Oct 2021

Calculation mistake in practice exam 2 in probabilites

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Posted on:

22 Jan 2022