Q10 of 41 Page 5

The weekly wages (in Rs) of 30 workers in a factory are.

830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840


Using tally marks make a frequency table with intervals as 800–810, 810–820 and so on.

For frequency distribution table, we need to count the wages lying in a particular class interval. For example for class interval 800 - 810. Count the number of wages lying between this range using tally marks, and for 800 - 810, 3 wages lie under it.

Tally marks are a quick way of keeping track of numbers in groups of five. One vertical line is made for each of the first four numbers; the fifth number is represented by a diagonal line across the previous four.

Frequency distribution table using the tally marks for the given data is:



Interval

Tally marks

Frequency

800-810

III

3

810-820

II

2

820-830

I

1

830-840

IIIIIIII

9

840-850

IIII

5

850-860

I

1

860-870

III

3

870-880

I

1

880-890

I

1

890-900

IIII

4

More from this chapter

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8

A bag contains 5 white and 7 red balls. One ball is drawn at random. What is the probability that ball drawn is white?

 9

The following pie chart gives the distribution of constituents in the human body. Find the central angle of the sector showing the distribution of protein and other constituents.

 11

Following figures relate to the weekly wages (in Rs.) of 15 workers in a factory :

300, 250, 200, 250, 200, 150, 350, 200, 250, 200, 150, 300, 150, 200, 250


Prepare a frequency table.


(i) What is the range in wages (in Rs)?


(ii) How many workers are getting Rs. 350?


(iii) How many workers are getting the minimum wages?

 12

In a hypothetical sample of 20 people the amounts of money with them were found to be as follows:

114, 108, 100, 98, 101, 109, 117, 119, 126, 131, 136, 143, 156, 168, 182, 195, 207, 219, 235, 118.


Draw the histogram of the frequency distribution (taking one of the class intervals as 50-100).