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The table given below shows the marks ou...

The table given below shows the marks out by 30 students in a test .

Out of these students , one is chosen at random . What is the probability that the marks of the chosen student ?
(i) are 30 or less (ii) are 31 or more ? (iii) lie in the interval 21-30 ?

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The correct Answer is:
(i) `(23)/(30) (ii) (7)/(30) (iii) (1)/(5)`
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RS AGGARWAL-PROBABILITY-Exercise 19
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  3. Three coins are tossed 200 times and we get three heads, 39 times , ...

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  4. A die is thrown 300 times and the outcomes are noted as given below : ...

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  5. In a survey of 200 ladies , it was found that 142 like coffee , while...

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  6. The percentages of marks obtained by a student in six unit tests are g...

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  7. On a particular day , at a crossing in a city , the various types of 2...

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  8. On one page of a telephone directory , there were 200 phone numbers . ...

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  9. The following table shows the blood groups of 40 students of a class. ...

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  10. 12 packets of salt , each marked 2 kg , actually contained the followi...

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  11. In a cricket match , a batsman hits a boundary 6 times out of 30 balls...

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  12. An organisation selected 2400 families at random and surveyed them to ...

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  13. The table given below shows the marks out by 30 students in a test . ...

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  14. The table given below shows the ages of 75 teachers in a school . ...

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  15. Following are the ages (in years) of 360 patients , getting medical tr...

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