Jump to

- Number Systems
- Polynomials
- Factorization of Polynomials
- Linear Equations In Two Variables
- Coordinate Geometry
- Introduction To Euclids Geometry
- Lines And Angles
- Triangles
- Congruence Of Triangles And Inequalities In A Triangle
- Quadrilaterals
- Areas Of Parallelograms And Triangles
- Circles
- Geometrical Constructions
- Areas Of Triangles And Quadrilaterals
- Volume And Surface Area Of Solids
- Mean Median And Mode Of Ungrouped Data
- Probability

Exercises in Chapter 18 mean median and mode of ungrouped data Grade 9

Questions in Mean Median And Mode Of Ungrouped Data Exercise 18A

The daily minimum temperature recorded (in oF) at a place during six days of a week was as under:

Day | Minimum Temperature |
---|---|

Mon | 35.5 |

Tue | 30.8 |

Wed | 27.3 |

Thurs | 32.1 |

Fri | 23.8 |

Sat | 29.9 |

Find the mean temperature.

Questions in Mean Median And Mode Of Ungrouped Data Exercise 18B

Obtain the mean of the following distribution:

Variable (xi) | Frequency (fi) |
---|---|

4 | 4 |

6 | 8 |

8 | 14 |

10 | 11 |

12 | 3 |

The following table shows the weights of 12 workers in a factory:

Weight (in kg) | No. of workers |
---|---|

60 | 4 |

63 | 3 |

66 | 2 |

69 | 2 |

72 | 1 |

Find the mean weight of the workers.

The measurements (in mm) of the diameters of the heads of 50 screws are given below:

Diameter (in mm) (xi) | Number of screws (fi) |
---|---|

34 | 5 |

37 | 10 |

40 | 17 |

43 | 12 |

46 | 6 |

Calculate the mean diameter of the heads of the screws.

The following data give the number of boys of a particular age in a class of 40 students.

Age (in years) | Frequency (fi) |
---|---|

15 | 3 |

16 | 8 |

17 | 9 |

18 | 11 |

19 | 6 |

20 | 3 |

Calculate the mean age of the students.

Find the mean of the following frequency distribution:

Variables (xi) | Frequency (fi) |
---|---|

10 | 7 |

30 | 8 |

50 | 10 |

70 | 15 |

89 | 10 |

Find the mean of daily wages of 40 workers in a factory as per data given below:

Daily wages (in ₹ ) (xi) | Number of workers (fi) |
---|---|

250 | 8 |

300 | 11 |

350 | 6 |

400 | 10 |

450 | 5 |

If the mean of the following data is 20.2, find the value of p.

Variable (xi) | Frequency (fi) |
---|---|

10 | 6 |

15 | 8 |

20 | p |

25 | 10 |

30 | 6 |

If the mean of the following data is 8, find the value of p.

x | f |
---|---|

3 | 6 |

5 | 8 |

7 | 15 |

9 | p |

11 | 8 |

13 | 4 |

Find the missing frequency p for the following frequency distribution whose mean is 28.25.

x | f |
---|---|

15 | 8 |

20 | 7 |

25 | p |

30 | 14 |

35 | 15 |

40 | 6 |

Find the value of p for the following frequency distribution whose mean is 16.6.

x | f |
---|---|

8 | 12 |

12 | 16 |

15 | 20 |

p | 24 |

20 | 16 |

25 | 8 |

30 | 4 |

Find the missing frequencies in the following frequency distribution whose mean is 34.

x | f |
---|---|

10 | 4 |

20 | f1 |

30 | 8 |

40 | f2 |

50 | 3 |

6 | 4 |

Total | 35 |

Find the missing frequencies in the following frequency distribution whose mean is 50.

x | f |
---|---|

10 | 17 |

30 | f1 |

50 | 32 |

70 | f2 |

90 | 19 |

Total | 120 |

Find the value of p, when the mean of the following distribution is 20.

x | f |
---|---|

15 | 2 |

17 | 3 |

19 | 4 |

20 + p | 5p |

23 | 6 |

The mean of the following distribution is 50.

x | f |
---|---|

10 | 17 |

30 | 5a+3 |

50 | 32 |

70 | 7a-11 |

90 | 19 |

Find the value of a and hence the frequencies of 30 and 70.

Questions in Mean Median And Mode Of Ungrouped Data Exercise 18C

Questions in Mean Median And Mode Of Ungrouped Data Exercise 18D

Chapters in this book

Lido

Courses

Quick Links

Terms & Policies

Terms & Policies

2022 © Quality Tutorials Pvt Ltd All rights reserved