# Use Graph Paper for this Question. the Table Given Below Shows the Monthly Wages of Some Factory Workers (I) Using the Table, Calculate the Cumulative Frequencies of Workers ( - Mathematics

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Use graph paper for this question.
The table given below shows the monthly wages of some factory workers
(i) Using the table, calculate the cumulative frequencies of workers
(ii) Draw a cumulative frequency curve.
Use 2 cm = ₹ 500, starting the origin at ₹ 6500 on x-axis, and 2 cm = 10 workers on the y – axis.

 Wages (in Rs) 6500-7000 7000-7500 7500-8000 8000-8500 8500-9000 9000-9500 9500-10000 No of workers 10 18 22 25 17 10 8

#### Solution

 Wages No. of workers c.f. 6500-7000 10 10 7000-7500 18 28 7500-8000 22 50 8000-8500 25 75 8500-9000 17 92 9000-9500 10 102 9500-10000 8 110

Total = 110
Now plot the points (7000,10), (7500,28), (8000,50), (8500,75), (9000,92), (9500,102) and (10000,110) and join them to obtain an ogive.

Concept: Finding the Median, upper quartile, lower quartile from the Ogive
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#### APPEARS IN

Selina Concise Maths Class 10 ICSE
Chapter 23 Graphical Representation
Exercise 23 | Q 7 | Page 349
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