aa1317aa

29.06.2019 • 

Mathematics

There are 32 students in mrs. worrells classroom. there are 12 boys and 20 girls. she needs to select two students to represent she class for a math contest. she will put all her students names on a piece of paper and randomly select two names, one after the other. what is the possibility that she will select a boy first and then a girl? a. 1/4 b. 15/64 c. 15/62 d. 1/2

Ответ:

gabrielrivasgom

10.03.2022

Mathematics

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C. 15/62

Step-by-step explanation:

The probability of drawing a boy's name first is 12/32. Then the probability of drawing a girl's name is 20/31, assuming the boy's name was not replaced. The joint probabiilty is the product of these:

... (12/32)·(20/31) = (3·4·5·4)/(16·2·31) = 15/62

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Ответ:

BreBreDoeCCx

26.10.2022

Mathematics

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Step-by-step explanation:

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