Home
Class 12
MATHS
Average height & variance of 5 students ...

Average height & variance of `5` students in a class is `150` and `18` respectively. A new student whose height is `156 cm` is added to the group. Find new variance. (a) `20` (b) `22` (c) `16` (d) `14`

A

22

B

20

C

16

D

18

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    MCGROW HILL PUBLICATION|Exercise QUESTION FROM PREVIOUS YEARS. B-ARCHITECTURE ENTRANCE EXAMINATION PAPERS|13 Videos

  • STATISTICS

    MCGROW HILL PUBLICATION|Exercise EXERCISE (NUMERICAL ANSWER TYPE QUESTIONS)|9 Videos

  • SETS, RELATIONS AND FUNCTIONS

    MCGROW HILL PUBLICATION|Exercise QUESTIONS FROM PREVIOUS YEAR.S B-ARCHITECTURE ENTRANCE EXAMINATION PAPERS|19 Videos

  • THE DIMENSIONAL GEOMETRY

    MCGROW HILL PUBLICATION|Exercise QUESTIONS FROM PREVIOUS YEARS. B-ARCHITECTURE ENTRANCE EXAMINATION PAPERS|25 Videos

Similar Questions

Explore conceptually related problems

The average height of the students in a class of 10 is 105 cm .If 20 more students with an average height of 120 cm join the class , what will the new average height be ?

5 students of a class have an average height 150cm and variance 18cm^(2) .A new student,whose height is 156cm joined them.The variance (in cm^(2) ) of the height of these six students is:

The average height of 8 students is 152 cm. Two more students of heights 144 cm and 155 cm join the group. What is the new average height?

The mean height of a group of 30 students is 150 cm. If a 150 cm tall student is included in the group, then find the mean heigh of the new group.

Average age of 17 student of a class is 16 years. If a new student join the class then average age becomes 20. Then find the age of new student.

The average height of 22 students of a class is 140 cm and the average height of 28 students of another class is 152 cm. What is the average height of students of both the classes?

The mean height of a group of 30 students is 150 cm. If a 150 cm tall student is included in the group , then the mean height of the new group is ___.

MCGROW HILL PUBLICATION-STATISTICS -QUESTION FROM PREVIOUS YEARS. AIEE/ JEE MAIN PAPERS
  1. The mean age of 25 teanchers of a school is 40 years. A teacher retire...

    Text Solution

    |

  2. The sum of 100 observations and sum of their squares are 400 and 2,475...

    Text Solution

    |

  3. If sum(i=1)^9 (xi-5)=9 and sum(i=1)^9 (xi-5)^2=45 then the standard d...

    Text Solution

    |

  4. The mean of a set of 30 observations is 75. If each observations is mu...

    Text Solution

    |

  5. If the mean of the data 7,8,9,7,lambda , 8, is 8 then variance of t...

    Text Solution

    |

  6. The mean and standard deviations (s.d.) of five observations are 9 an...

    Text Solution

    |

  7. Average height & variance of 5 students in a class is 150 and 18 respe...

    Text Solution

    |

  8. A data consists of n observations: x1,x2,…….xn ,"If" underset( i=1) o...

    Text Solution

    |

  9. The mean of five observations is 5 and their variance is 9.20. If thr...

    Text Solution

    |

  10. If mean and standard deviation of 5 observations x1,x2,x3,x4 are 10 an...

    Text Solution

    |

  11. The outcome of each of 30 items was observed , 10 items gave an outcom...

    Text Solution

    |

  12. If the sum of the deviations of 50 observations from 30 is 50, then th...

    Text Solution

    |

  13. Mean and variance of five observations are 4 and 5.2 respectively. If ...

    Text Solution

    |

  14. The mean and variance of 7 observations are 8 and 16, respectively....

    Text Solution

    |

  15. A student scores the following marks in five tests 45, 54, 41, 57, 43....

    Text Solution

    |

  16. If the standard deviation of the numbers -1, 0,1,k is sqrt(5) where ...

    Text Solution

    |

  17. The mean and the median of the following ten numbers in increasing ord...

    Text Solution

    |

  18. If for somes x in R the frequency distribution of marks obtained by ...

    Text Solution

    |

  19. If both the mean and the standard deviation of 50 observatios x(1), x(...

    Text Solution

    |

  20. If the data x1,x2,….x10 is such that the mean of four of these is 11,...

    Text Solution

    |