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alekssr [168]
3 years ago
8

It was 9/20 ..

Mathematics
1 answer:
Elza [17]3 years ago
6 0

Answer:

\frac{9}{20}

Step-by-step explanation:

We want probability that 1st is girl AND 2nd is girl as well.

In probability "AND" means multiplication and "OR" means "addition".

<u><em>We find the probabilities separately and multiply them together, since "AND".</em></u>

<u><em /></u>

  • P(girl from 7th grader) = number of girl 7th grader/total number of 7th grader

=9/10

  • P(girl from 8th grade) = number of girl in 8th grade/total number of 8th grader

=2/4

P(both girls) = 9/10 * 2/4 =9/20

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