# Statistics - NCERT Class 9 Maths

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## Question 1

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

### Solution

Steps:

Think of data we can collect in our day to day life, in and around where we live

1. Number of houses that own a four-wheeler in our housing society.
2. Monthly grocery expenses of our family.
3. Number of people who have used e-services of the state govt over a year.
4. Number of students who have enrolled for math Olympiad in your class.
5. Population increase in percentage over the past five years in our city.

## Question 2

Identify the data in $$14.1(1)$$ above as primary or secondary.

### Solution

Reasoning:

Think how have you collected the data:

1. Did you collect the data all by yourself investigating around? If yes, primary.
2. Did you obtain the data from a source where the information has been stored already? If yes, secondary.

Steps:

Based on the observation, data in $$2, 4$$ are primary and the data in $$1, 3$$ and $$5$$ are secondary.

The chapter 14 begins with the collection of data followed by the presentation of data.  The focus then shifts to the graphical representation of data which includes bar graph, histograms and frequency polygons with various kinds of examples. We next see the three measures of central tendency for ungrouped data which includes mean, median and mode with a set of examples.