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In , you were asked to prepare a frequency distribution table regarding the blood groups of 30 students of a class. Use this table to determine the probability that a student of this class, selected at random, has blood group AB.

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In , you were asked to prepare a frequency distribution table regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 day . Using this table , find the probability of the concentration of sulphur dioxide in the interval 0.12 - 0.16 on any of these days .

A study was conducted to find out the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city. The data obtained for 30 days is as follows : You were asked to prepare a frequency distribution table, regarding the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city for 30 days . Using this table, find the probability of the concentration of sulphur dioxide in the interval 0.12-0.16 on any of these days.

Given below is a cumulative frequency distribution showing the marks secured by 50 students of a class: Form the frequency distribution table for the above data

In a class of 100 students 60 drinks tea. 50 drink coffee and 30 drink both .A students from this class is selected at random.Find the probability that the student takes (i) atleast one of the two drinks (ii) only one of the two drinks

In a particular section of class IX, 40 students were asked about thhe months of their birth the following graph was prepared for the data so obtained . Find the probability that a student of the class was born in August.

Blood groups of 200 people are as follows: A-50 B-65 O-70 AB-15. if a person is selected at random, what is the probability that he has 'O' blood type ?

There are n students in a class. Ler P(E_lambda) be the probability that exactly lambda out of n pass the examination. If P(E_lambda) is directly proportional to lambda^2(0lelambdalen) . If P(A) be the probability that a student selected at random has passed the examination, then P(A), is

There are n students in a class. Let P(E_lambda) be the probability that exactly lambda out of n pass the examination. If P(E_lambda) is directly proportional to lambda^2(0lelambdalen) . If a selected student has been found to pass the examination, then the probability that he is the only student to have passed the examination, is

In a class of 60 students. 30 opted for NCC, 32 opted for NSS and 24 opted for both NCC and NSS. If one of these students is selected at random, find the probability that (i) The student opted for NCC or NSS. (ii) The student has opted neither NCC nor NSS. (iii) The students has opted NSS but not NCC.

Activity : Ask all the students in your class to write a 3 - digit number. Choose any student from the room at random. What is the probability that the number written by her/him is divisible by 3 ? Remember that a number is divisible by 3 , if the sum of its digits is divisible by 3.

SUBHASH PUBLICATION-PROBABILITY -EXERCISE 15.1
  1. 1500 families with 2 children were selected randomly, and the followin...

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  2. In a particular section of Class IX, 40 students were asked about the ...

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  3. Three coins are tossed simultaneously 200 times with the following fre...

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

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

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

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

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

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  9. A teacher analyses the performance of two sections of students in a ma...

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  10. A teacher analyses the performance of two sections of students in a ma...

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  11. To know the opinion of the students about the subject statistics , a s...

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  12. To know the opinion of the students about the subject statistics , a s...

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  13. Distance (in km) of 40 engineers from their place of residence to thei...

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  14. Distance (in km) of 40 engineers from their place of residence to thei...

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  15. Distance (in km) of 40 engineers from their place of residence to thei...

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  16. Activity : Note the frequency of two - wheelers , three - wheelers and...

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  17. Activity : Ask all the students in your class to write a 3 - digit num...

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  18. Eleven bags of wheat flour, each marked 5 kg actually contained the fo...

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  19. In , you were asked to prepare a frequency distribution table regardin...

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  20. In , you were asked to prepare a frequency distribution table regardin...

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