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Nata [24]
3 years ago
15

In a second grade class containing 13 girls and 9 boys, 2 students are selected at random to give out the math papers. What is t

he probability that the second student chosen is a boy, given that the first one was a girl?
Mathematics
2 answers:
Finger [1]3 years ago
8 0
13/22 x 9/21 = 0.25                                               
Rashid [163]3 years ago
4 0

Answer:

42.86% probability that the second student chosen is a boy, given that the first one was a girl.

Step-by-step explanation:

Initially, there are 22 students, of which 13 are girls and 9 are boys.

The first student chosen was a girl, so now there are 21 students, of which 12 are girls and 9 are boys.

What is the probability that the second student chosen is a boy, given that the first one was a girl?

There are 21 students, of which 9 are boys. So there is a 3/7 = 0.4286 = 42.86% probability that the second student chosen is a boy, given that the first one was a girl.

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Answer: 0.8490

Step-by-step explanation:

Given :  The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.0 inches and a standard deviation of 0.9 inches.

i.e. \mu=30 and \sigma=0.9

Let x denotes the lengths of aluminum-coated steel sheets.

Required Formula : z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}

For n= 36 , the probability that the average length of a sheet is between 29.82 and 30.27 inches long will be :-

P(29.82

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Step-by-step explanation:

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mr_godi [17]
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3 years ago
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Nitella [24]

Answer:

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Step-by-step explanation:

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7 0
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Step-by-step explanation:

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