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Find the probability that a student obta...

Find the probability that a student obtained marks 60 or above.

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Refer to sum 5 of 'Sums to Enrich 'Remember''' in chapter 14. Find the probability that a student of the class was born in August.

The following table given the marks scored by 50 students in a 100 marks test of Mathematics. {:("Marks",0-20,20-40,40-60,60-80),("No of "3,12,18,10,7),("students",,,,):} A student is selected randomly from the class. Find the probability that selected student has scored 60 or more than 60 marks.

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

The percentage of marks obtained by a student in the monthly unit tests are given below : {:("Unit test",I,II,III,IV,V),("Percentage of ",69,71,73,68,74),("mark obtained",,,,,):} Based on this data, find the probability that the student gets more than 70% marks in a unit test.

The probability that a student will pass his examination is 0.73, the probability of the student getting a compartment is 0.13, and the probability that the student will either pass or get compartment is 0.96.

(i) Find the probability of the students getting more than 40 marks. (2) Find the probability of the students getting less than 30 marks.

In answering a question on a multiple choice test, a student either knows the answer or guesses. Let (3)/(4) be the probability that he knows the answer and (1)/(4) be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability (1)/(4) . What is the probability that the student knows the answer given that he answered it correctly?

Consider the frequency distribution tabe (Table 3, sum no . 4 of ''Sums to Enrich 'Remember''' Chapter 14) , which gives the weights of 38 students of class. Find the probability that the weight of a student in the class lies in the interval 46 - 50 kg.

KUMAR PRAKASHAN-PROBABILITY -EXERCISE 15.1
  1. 1500 families with 2 children were selected randomly , and the followi...

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  2. The following table given the marks scored by 50 students in a 100 mar...

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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. Find the probability that a student obtained marks 60 or above.

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  10. The following table given the marks scored by 50 students in a 100 mar...

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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. What is the empirical probability that an engineer lives : within 1...

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  14. What is the empirical probability that an engineer lives : within 1...

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  15. Find the probability that a number selected at random from 1 to 100 is...

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  16. 5 girls and 10 boys sit at random in a row having 15 chairs numbered a...

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  17. Out of 3n consecutive integers, three are selected at random. Find t...

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

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

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  20. Everyone should have knowledge about his/her blood group as well as th...

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