100 students of a school are selected at random. The marks scored (out

1.	100 students of a school are selected at random. The marks scored (out of 50 marks) by them in the recently held unit test are tabulated below.MarksNumber of students0-10510-201020-303530-403640-5014If a student is chosen randomly, then what is the probability that the randomly chosen student scores less than 40% marks?
Answer» Total number of students among whom the survey was conducted = 100 40% of 50 = (40/100) x 50 = 20 The students scoring less than 40% marks are the students who scored less than 20 marks. From the given table it is observed that there are 5 + 10 = 15 students who scored less than 40% marks. ∴ Required probability = 15/100 = 3/20.

100 students of a school are selected at random. The marks scored (out of 50 marks) by them in the recently held unit test are tabulated below.MarksNumber of students0-10510-201020-303530-403640-5014If a student is chosen randomly, then what is the probability that the randomly chosen student scores less than 40% marks?

Answer»

Total number of students among whom the survey was conducted = 100

40% of 50 = (40/100) x 50 = 20

The students scoring less than 40% marks are the students who scored less than 20 marks. From the given table it is observed that there are 5 + 10 = 15 students who scored less than 40% marks.

∴ Required probability = 15/100 = 3/20.

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