Shaalaa.com | Tabulation of Data and Parts of a Table
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.
|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|
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?
The following table shows the number of students and the time they utilized daily for their studies. Find the mean time spent by students for their studies by direct method.
|Time (hrs.)||0 - 2||2 - 4||4 - 6||6 - 8||8 - 10|
|No. of students||7||18||12||10||3|
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.
|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|