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kenny6666 [7]
3 years ago
6

The probability of Mrs. Galvan randomly selecting a black pen from the 20 pens in her drawer is . Which of the following describ

es the likelihood of selecting a black pen?
Mathematics
1 answer:
aleksandrvk [35]3 years ago
7 0
I believe there is a 1/20 chance that Mrs. Galvan will pick a black pin. Since there are 20 pens, each pen has an equal chance of getting picked. For example, you have 2 pens and one of them is blue. The chance of me getting the blue pen is 1/2 or a 50% chance. So your answer will be 1/20 chance.
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Start by converting both to improper fractions.

8 1/2 = (2*8 + 1)/2 = 17/2

3 1/4 = (3*4 + 1)/4 = 13/4

Next set up a 4 layer fraction

\dfrac{\dfrac{17}{2}}{\dfrac{13}{4} }

Invert the lower fraction and multiply\dfrac{17}{2}* \dfrac{4}{13}

Cancel the 2 and the 4 leaving you with a 2 in the numerator.\dfrac{17*2}{13} =\dfrac{34}{13} 

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Step-by-step explanation:

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