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3 years ago

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In a school gym the ratio of the number of boys to the number of girls were 4:3. After 160 days boys left the gym, the ratio bec

ame 4:5. How many girls were there in the gym?

2 answers:

uysha [10]3 years ago

7 0

The Answer is 300 girls.

Allisa [31]3 years ago

4 0

<span>11/29/2017QQuiz 2: Supporting Speeches11/29/2017</span><span>QQuiz 2: Supporting Speeches11/29/2017</span><span>QQuiz 2: Supporting Speeches</span>

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And replacing we got:

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Step-by-step explanation:

For this case we have the following info given:

$\mu = 2.2$ represent the mean

$\sigma = 6$ represent the deviation

We select a sample size of n=100. This sample is >30 so then we can use the central limit theorem. And we want to find the distribution for the sample mean and we know that the distribution is given by:

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And replacing we got:

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3 years ago