The marks of 100 students (out of 80) in English speaking skills was recorded as follows:
Marks 0-20 21-39 40-60 61-80 No. of students 18 19 23 20
If the passing mark are 50%, then find the probability that the student choosen at random:
got the passing marks.
failed to get the passing marks.
got below 21 marks.
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Answered by
43
Solution :-
Total Marks = 80
Passing marks = 50 % of 80
= 40 Marks
1) Probability of students who got the passing marks
= Number of students getting 40 marks and above/Total students
= (23 + 20)/100
= 43/100
= 0.43
2) Probability of the students who failed to get the passing marks
= Number of students getting below 40 marks/Total students
= (18 + 190/100
= 37/100
= 0.37
3) Probability of students who got below 21 marks
= Number of students getting below 21 marks/Total students
= 18/100
= 0.18
Answer.
Total Marks = 80
Passing marks = 50 % of 80
= 40 Marks
1) Probability of students who got the passing marks
= Number of students getting 40 marks and above/Total students
= (23 + 20)/100
= 43/100
= 0.43
2) Probability of the students who failed to get the passing marks
= Number of students getting below 40 marks/Total students
= (18 + 190/100
= 37/100
= 0.37
3) Probability of students who got below 21 marks
= Number of students getting below 21 marks/Total students
= 18/100
= 0.18
Answer.
Golda:
Sorry, it is (18 + 19)100 = 0.37
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