Home
Class 9
MATHS
A teacher analyses the performance of tw...

A teacher analyses the performance of two sections of students in a mathematics test of 100 marks given in the following table :
: Find the probability that a student obtained less than 20 marks in the mathematics test.

Text Solution

Verified by Experts

The correct Answer is:
`7/90`
Promotional Banner

Topper's Solved these Questions

  • PROBABILITY

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Multiple Choice Questions (MCQs)|10 Videos

  • PROBABILITY

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Skill Testing Exercise|8 Videos

  • LINE AND ANGLES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Multiple Choice Questions MCQs)|10 Videos

  • SURFACE AREAS AND VOLUMES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise MULTIPLE CHOICE QUESTIONS|18 Videos

Similar Questions

Explore conceptually related problems

Calculate the mean of the scores of 20 students in a mathematics test

A teacher wanted to analysis the performance of two sections of students in a mathematics test of 100 marks. Looking performance, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows : 0-20, 20-30, ....., 60-70, 70-100. Then she formed the following table : |{:("Marks"," Number of students"),(0-20," 7"),(20-30," 10"),(30-40," 10"),(40-50," 20"),(50-60," 20"),(60-70," 15"),(70-"above"," 8"),("Total"," 90"):}| (i) Find the probability that a student obtained less than 20% in the mathematics test. (ii) Find the probability that a student obtained marks 60 or above .

The percentage of marks of 50 students in a test is given in the following table. Find the mean of the percentage.

The percentage of marks obtained by a student in the monthly unit tests are given below.Based on this data,find the probability that the student gets more

The percentages of marks obtained by a student in six unit tests are given below : A unit test is selected at random . What is the probability that the student gets more than 60% marks in the test ?

The marks of 20 students in an examination are given in the following table. Average marks of these student is:

Marks ( out of 50) obtaned in Mathematics by 100 students is given in the following table. Find the mean by direct method and step deviation method :

The percentage of marks obtained by a student in a monthly test is as follows: What is the probability that the student gets more than 75% marks in a test?

NAVNEET PUBLICATION - MAHARASHTRA BOARD-PROBABILITY -EXERCISE 15.1
  1. 1500 families with 2 children were selected randomly , and the followi...

    Text Solution

    |

  2. Refer to Example 5, Section 14.4, Chapter 14. Find the probability ...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  13. Refer to Q.2, Exercise 14.2. What is the empirical probability that a...

    Text Solution

    |

  14. Refer to Q.2, Exercise 14.2. What is the empirical probability that a...

    Text Solution

    |

  15. Refer to Q.2, Exercise 14.2. What is the empirical probability that a...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  20. In Q.1, Exercise 14.2, you were asked to prepare a frequency distri...

    Text Solution

    |