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?

0.15

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0.3

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0.35

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0.7

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Solution

The correct option is D
0.7

Total number of students in a class = 50

Number of students who passed an examination = 35

Probability that a student passed the exam = $\frac{Number of students who passed an examinatio}{Total number of students in a class}$

Probability that a student passed the exam = $\frac{35}{50} = 0.7$ .

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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.

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

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$\begin{matrix} P a s s e d M a t h & P a s s e d E n g l i s h P a s s e d M a t h & 25 & 20 P a s s e d M a t h & 35 & 20 \end{matrix}$

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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 = ___ .

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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?

The correct option is D 0.7 Total number of students in a class = 50 Number of students who passed an examination = 35 Probability that a student passed the exam = Number of students who passed an examinatioTotal number of students in a class Probability that a student passed the exam = 3550=0.7.