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2 years ago

14

Each boy in a class has 7 pockets and each girl in that class has 11 pockets. How many boys and how many girls are there in this

class if there are 147 pockets and 17 heads?

1 answer:

amm18122 years ago

5 0

7 girls, because 11(7)+7(10)+147

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Answer:

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Step-by-step explanation:

We are given the following information in the question:

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$P( A|B) = \displaystyle\frac{P(A \cap B)}{P(B)}$

Now, let A be the event where the dog is deaf and B be the the event where dog is blue eyed.

$P( \text{ Deaf}|\text{Blue eyes}) = \displaystyle\frac{P( \text{Deaf} \cap \text{Blue eyes})}{P(\text{Blue eyes})}\\\\0.42 = \displaystyle\frac{P( \text{Deaf} \cap \text{Blue eyes})}{0.31}\\\\P( \text{Deaf} \cap \text{Blue eyes}) = 0.42\times 0.31 = 0.1302 = 13.02\%$

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