Home
Class 14
MATHS
A random sample of 20 people is classifi...

A random sample of 20 people is classified in the following table according to their ages:

What is the mean age of this group of people?

A

41

B

41.5

C

42

D

42.5

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • STATISTICS

    PUNEET DOGRA|Exercise PRE YEAR QUESTIONS |163 Videos

  • SET & RELATION

    PUNEET DOGRA|Exercise PREV YEAR QUESTIONS|65 Videos

  • TRIGONOMETRY

    PUNEET DOGRA|Exercise PREV YEAR QUESTIONS|163 Videos

Similar Questions

Explore conceptually related problems

A random sample of 20 people is classified in the following table according to their ages : |{:("Age","Frequency"),(15-25," 2"),(25-35," 4"),(35-45," 6"),(45-55," 5"),(55-65," 3"):}| What is the mean age of this group of people?

The following table given the age of 500 students in a school. Calculate the average age:

The ratio of the average ages of three people and the other two in a group of five people is 9 : 7. If the difference of their averages is 12, then find out the average age of all 5 people?

The average age of 5 sisters is 20 yr. If the age of the youngest sister be 4 yr, what was the average age of the group of sisters at the birth of the youngest sister?

Direction Read the following passage and answer the questions based on it. Read the passage given below and answer the question that follow: In a club of 30 people, all of them belong to at least one group - Chess, Drama and Art. 6 people belong only to the Art group. 5 people belong to all the three groups. 2 people have joined the Chess and the Art group but not the Drama group. 15 people belong to the Art group.2 people have joined only the Chess group. 3 people have joined only the Drama group. How many people have joined the Chess and the Drama group but not the Art group? (A) 12 (B) 10 (C ) 15 (D) 13

PUNEET DOGRA-STATISTICS-PRE YEAR QUESTIONS
  1. In a study of two groups, the following results were obtained Wh...

    Text Solution

    |

  2. Consider the following statements in respect of class intervals of gro...

    Text Solution

    |

  3. A random sample of 20 people is classified in the following table acco...

    Text Solution

    |

  4. If the covariance between x and y is 30. variance of A is 25 and varia...

    Text Solution

    |

  5. The scores of 15 students in an examination were recorded as 10, 5, 8,...

    Text Solution

    |

  6. If x+y=18 and xy=72, what is the vlaue of x^(2)+y^(2)?

    Text Solution

    |

  7. Two variates, x and y, are uncorrelated and have standard deviations,s...

    Text Solution

    |

  8. If the total number of observations is 20. Sigmax(i)= 1000 and Sigmax(...

    Text Solution

    |

  9. What is the mean deviation from the mean of the numbers 10, 9, 21, 16....

    Text Solution

    |

  10. Mean of n observations x1,x2,….,xn is barx. If an observation xq is re...

    Text Solution

    |

  11. For the data 3, 5, 1, 6, 5, 9, 5, 2, 8, 6 the mean median and mode are...

    Text Solution

    |

  12. Simplify:- 1/8 of 2/3 of 3/5 of 1715 = ?

    Text Solution

    |

  13. The regression coefficients of a bivariate distribution are -0.64 and ...

    Text Solution

    |

  14. Which one of the following measures of central tendency will be used t...

    Text Solution

    |

  15. Simplify:- ?% of 950 + 782 = 1200

    Text Solution

    |

  16. Match List-I with List-II and select the correct answer from the codes...

    Text Solution

    |

  17. The mean of five numbers is 30. If one number is excluded, their mean ...

    Text Solution

    |

  18. Draw 'less than' and 'more than' ogive curves from the following data ...

    Text Solution

    |

  19. The arithmetic mean of 1. 8. 27 64.. upto n terms is given by y

    Text Solution

    |

  20. The geometric mean of the observations x(1),x(2)x(3)…x(n) is G. The g...

    Text Solution

    |