Shaalaa.com  Tabulation of Data and Parts of a Table
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A frequency distribution of funds collected by 120 workers in a company for the drought affected people are given in the following table. Find the mean of the funds by 'step deviation' method.
Fund (Rupees)

0  500  500  1000  1000  1500  1500  2000  2000  2500 
No. of workers  35  28  32  15  10 
The following data shows the number of students using different modes of transport:
Modes of Transport  Number of Students 
Bicycle  140 
Bus  100 
Walk  70 
Train  40 
Car  10 
From this table, find the central angle (θ) for the Mode of Transport ‘Bus’.
The following frequency distribution table shows the distances travelled by some rickshaws in a day. Observe the table and answer the following questions
Class (daily distance travelled in km)  continuous classes  Frequency (no.of. rickshaws)  Cumulative frequency less than type 
60  64  59.5  64.5  10  10 
65  69  64.5 69.5  34  10+34=44 
70  74  69.5  74.5  58  44+58=102 
75  79  74.5  79.5  82  102+82=184 
80  84  79.5  84.5  10  184+10=194 
85  89  84.5  89.5  6  194+6=200 
1) Which is the modal class? Why?
2) Which is the median class and why?
3) Write the cumulative frequency (C.F) of the class preceding the median class.
4) What is the class interval (h) to calculate median?
In the following table, the toll paid by drivers and the number of vehicles is shown. Find the mean of the toll by 'assumed mean' method.
Toll (Rupees)  300  400  400  500  500  600  600  700  700  800 
No. of vehicles  80  110  120  70  40 
A milk centre sold milk to 50 customers. The table below gives the number of customers and the milk they purchased. Find the mean of the milk sold by direct method.
Milk Sold (Litre)  1  2  2  3  3  4  4  5  5  6 
No. of Customers  17  13  10  7  3 
A frequency distribution table for the production of oranges of some farm owners is given below. Find the mean production of oranges by 'assumed mean' method.
Production
(Thousand rupees)

25  30  30  35  35  40  40  45  45  50 
No. of Customers  20  25  15  10  10 
The following table gives the information of frequency distribution of weekly wages of 150 workers of a company. Find the mean of the weekly wages by 'step deviation' method.
Weekly wages (Rupees)

1000  2000  2000  3000  3000  4000  4000  5000 
No. of workers  25  45  50  30 