Question
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 = ___ .
Answer:
:
Let the number of students in a class be x.
The probability of students passing an exam = 0.6
Number of students who failed an exam = 20
Number of students who passed an exam =x−20
Probability of a student passing an exam =Number of students who passed an examsNumber of students in a class
0.6=x−20x
0.6x=x−20
0.4x=20
x=50
The number of students in the class is 50.
Was this answer helpful ?
:
Let the number of students in a class be x.
The probability of students passing an exam = 0.6
Number of students who failed an exam = 20
Number of students who passed an exam =x−20
Probability of a student passing an exam =Number of students who passed an examsNumber of students in a class
0.6=x−20x
0.6x=x−20
0.4x=20
x=50
The number of students in the class is 50.
Was this answer helpful ?
More Questions on This Topic :
Latest Videos
Latest Test Papers
Submit Solution