Out of 50 students in a class taking a test, 35 of them passed whereas the other 15 failed. The probability that a student selected at random passed the exam is 0.8.

0.15

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0.3

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Solution

The correct option is B
0.3

Total number of students in a class = 50

Number of students who passed an examination = 35

$P (P) = \frac{Number of favourable outcomes}{Total number of possible outcomes}$

where P(P) = Probability that student passed the exam

= $\frac{Number of students passed examination}{Total number of students in a class}$

= $\frac{35}{50} = 0.7$ .

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Similar questions

Out of 50 students in a class taking a test, 35 of them passed whereas the other 15 failed. What is the probability that a student selected at random passed the test?

Out of 50 students in a class taking a test, 35 of them passed whereas the other 15 failed. What is the probability that a student drawn at random passed the exam?

Q. There are

50

students in a class and their results is below:

Result (Pass/Fail)	Pass	Fail
No. of students	$35$	$15$

If a student chosen at random out of the class (i.e., without any bias), find the probability that the student is not failing (i.e., the student passed the examination).

If 20 students in a class failed an exam, the probability of a student selected at random getting passed in an exam is 0.6. The number of students in the class is = ___ .

In a class of 35 students, 20 students passed and 15 failed in a certain exam. The ratio of the number of passed students to the number of failed students is:

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