Q2 of 26 Page 239

Classify the data in Q.1 above as primary or secondary data.

The above data after classifying into secondary and primary data is:

Primary data:


i. Daily expenditures of household materials.


ii. Bill of electricity.


iii. Marks obtained by students in distinguished subjects.


Secondary data:


i. Amount of rainfall in a year.


ii. Various survey and poll results.


More from this chapter

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1

Give five examples of data that you can collect from your day-to-day life.

 1

The blood groups of 30 students of Class VIII are recorded as follows:

A, B, O, O, AB, O, A, O, B, A, O, B, A, O, O,


A, AB, O, A, A, O, O, AB, B, A, O, B, A, B, O


Represent this data in the form of a frequency distribution table. Which is the most common, and which is the rarest, blood group among these students?

 2

The distance (in km) of 40 engineers from their residence to their place of work were found as follows:

5 3 10 20 25 11 13 7 12 31


19 10 12 17 18 11 32 17 16 2


7 9 7 8 3 5 12 15 18 3


12 14 2 9 6 15 15 7 6 12


Construct a grouped frequency distribution table with class size 5 for the data given above taking the first interval as 0-5 (5 not included). What main features do you observe from this tabular representation?

 3

The relative humidity (in %) of a certain city for a month of 30 days was as follows:

98.1 98.6 99.2 90.3 86.5 95.3 92.9 96.3 94.2 95.1


89.2 92.3 97.1 93.5 92.7 95.1 97.2 93.3 95.2 97.3


96.2 92.1 84.9 90.2 95.7 98.3 97.3 96.1 92.1 89


(i) Construct a grouped frequency distribution table with classes 84 - 86, 86 - 88, etc.


(ii) Which month or season do you think this data is about?


(iii) What is the range of this data?