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There are 3 first grade children, 5 second grade children, and 7 third grade children in a room. When choosing two children, what is the conditional probability of choosing a second grade child, given that either a first or a third grade child was chosen first?

2 Answers

2 votes

Answer:

35.14%

IM NOT SURE WHY BUT I TOOK THE TEST ALSO I CANT TURN OFF MY CAPS LOCK LOL

User Raddykrish
by
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4 votes

Answer:

0.3571 or 35.14%

Explanation:

There are 15 children in total in the class at first. Of those children, 5 are second graders and 10 are not.

If the first chosen children was not a second grader, there are 5 second graders among the 14 children left. The probability of selecting a second grade child is:


P = (5)/(14)\\P=0.3571\\P=35.71\%

The probability is 0.3571 or 35.14%.

User Happier
by
7.6k points

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