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Elena-2011 [213]
3 years ago
12

there is a ratio of 5 boys to 3 girls in the chorus. They are 24 boys in the chorus. How many girls are there?

Mathematics
2 answers:
Nana76 [90]3 years ago
7 0
Ok, so at first this question seems tricky, since 5 does not go into 25.  However, you can't have a percentage of 1 person.  Since 5 goes into 25 5 times, then we will go with that.  So multiply 3 x 5 to get 15 girls.  Because you can't have a fraction of a single person.
Kobotan [32]3 years ago
7 0
You have to use proportion for this problem, so you do 
 
5 boys  =  3 girls
24 boys =  ? girls
24 times 3 equals 72. 72 divided by 5 equals 14.4. You have to round this answer to get 15 girls.
Hope this helped :D
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<u>Answer:</u>

The probability of a randomly selected student scoring in between 77.6 and 88.4 is 0.8185.

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And a standard deviation of 3.6.  

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For that we are going to subtract probability of getting more than 88.4 from probability of getting more than 77.6  

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