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junior2461
25.02.2020 •
Mathematics
There are 10 rolls of film in a box and 3 are defective. Two rolls are to be selected without replacement. What is the probability of selecting a defective roll followed by another defective roll?
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Ответ:
Step-by-step explanation:
Given : Total rolls of film in the box = 10
Defective rolls =3
Probability of selecting first defective roll =![\dfrac{\text{Number of bad rolls}}{\text{Total rolls}}](/tpl/images/0522/9625/d4b2b.png)
Now , total rolls left = 9
Total defective rolls left = 2
Probability of selecting second defective roll =![\dfrac{\text{Number of bad rolls}}{\text{Total rolls}}](/tpl/images/0522/9625/d4b2b.png)
Now , the probability of selecting a defective roll followed by another defective roll =![\dfrac{3}{10}\times\dfrac{2}{9}=\dfrac{1}{15}](/tpl/images/0522/9625/42c36.png)
Hence, the probability of selecting a defective roll followed by another defective roll is
.
Ответ:
slope is -1/4 and y intercept is 1
Step-by-step explanation:
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