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14.01.2020 •
Mathematics
Xavier, yvonne, and zelda each try independently to solve a problem. if their individual probabilities for success are 1/4, 1/2 and 5/8, respectively, what is the probability that xavier and yvonne, but not zelda, will solve the problem?
a. 11/8
b. 7/8
c. 9/64
d. 5/64
e. 3/64
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Ответ:
The probability that Xavier and Yvonne can solve a problem but Zelda cannot is![\frac{3}{64}](/tpl/images/0454/9827/8fe9d.png)
Step-by-step explanation:
We are given:
Probability of success of Xavier,![P(S)_{Xavier}=\frac{1}{4}](/tpl/images/0454/9827/b116a.png)
Probability of failure of Xavier,![P(F)_{Xavier}=1-\frac{1}{4}=\frac{3}{4}](/tpl/images/0454/9827/5c809.png)
Probability of success of Yvonne,![P(S)_{Yvonne}=\frac{1}{2}](/tpl/images/0454/9827/94b1f.png)
Probability of failure of Yvonne,![P(F)_{Yvonne}=1-\frac{1}{2}=\frac{1}{2}](/tpl/images/0454/9827/8fd9a.png)
Probability of success of Zelda,![P(S)_{Zelda}=\frac{5}{8}](/tpl/images/0454/9827/5a843.png)
Probability of failure of Zelda,![P(F)_{Zelda}=1-\frac{5}{8}=\frac{3}{8}](/tpl/images/0454/9827/fe177.png)
We need to calculate:
The probability that Xavier and Yvonne can solve the problem but Zelda cannot, we use:
Hence, the probability that Xavier and Yvonne can solve a problem but Zelda cannot is![\frac{3}{64}](/tpl/images/0454/9827/8fe9d.png)
Ответ: