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Sindrei [870]
2 years ago
9

In a class of 20 students, 9 are female and 15 have an A in the class. There are 2 students who are male and do not have an A in

the class. What is the probability that a student has an A given that the student is female?
Mathematics
1 answer:
MrRissso [65]2 years ago
4 0

Answer:

1/20

there are 20 students altogether

Step-by-step explanation:

um I'm not sure

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7 0
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A bag contains some number of marbles. It is known that 20 of them are red. When 15 marbles are drawn, without replacement, we g
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Answer:

The total number of marbles in the bag is 50.

Step-by-step explanation:

Here, we have n trials, without replacement. So the hypergeometric distribution is used.

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In which n is the number of items in the sample, k is the number of items in the population that are classified a success and N is the size of the population.

15 marbles are drawn:

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A bag contains some number of marbles. It is known that 20 of them are red.

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Assuming E(X)=6 red, what is the total number of marbles in the bag?

We have to find N when E(X) = 6

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E(X) = \frac{n*k}{N}

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8 0
2 years ago
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fomenos

Answer:

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Answer:

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