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Exercises in Chapter 16 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

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