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Standard IX

Mathematics

Probability

If 30 student...

Question

If 30 students in a class use blue pen and 20 use black, then the probability of getting a black pen when you ask to borrow one is 0.2.

True

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False

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Solution

The correct option is B
False

Probability of getting a black pen when you ask to borrow a pen = $\frac{20}{(20 + 30)} = 0.4$

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If 30 students in a class use blue pen and 20 use black, then the probability of getting a black pen when you ask to borrow one is 0.2.

The correct option is B False Probability of getting a black pen when you ask to borrow a pen =20(20+30)=0.4

The correct option is B
False

Probability of getting a black pen when you ask to borrow a pen = $\frac{20}{(20 + 30)} = 0.4$