Data Handling

**Category : **7th Class

**Data Handling**

Modern society is information oriented. Every person wants numeric information of different fields of the society like the marks obtained in a particular subject by the students, five year plans etc. Statistics is a branch of mathematics which deals with the process, analyzing and interpreting the data.

** **

**Terms Related to Data**

**Data:**It is defined as the particular information in numeric form.**Primary data:**Primary data means the data that have been collected by collector for some purpose.**Secondary data:**Secondary data is data that have been collected by others and used by other observer.**Raw data:**It is the original form of the data.**Frequency:**The number of times a particular observation occurs in a data is called frequency.**Range:**The difference between maximum and minimum value of the observation is called range.**Class Interval:**The interval in which variates lies is called class interval.**Class Mark.**= \[\frac{1}{2}\](lower limit + upper limit)

**Example:**

The runs scored by 11 members of a cricket team are as follows.

34, 0, 25, 34, 67, 73, 67, 1, 0, 34, 71.

Arrange the above data using tally marks.

**Solution:**

Scores |
Tally Mark |
Frequency |

0 |
II |
2 |

1 |
I |
1 |

25 |
I |
1 |

34 |
III |
3 |

67 |
II |
2 |

71 |
I |
1 |

73 |
I |
1 |

**Example:** The total sales of a company (in crores) in different years are as follows.

Years |
2005 |
2006 |
2007 |
2008 |
2009 |

Sales (in Crores) |
40 |
60 |
70 |
50 |
30 |

Present the above data in the form of a bar graph.

**Solution:**

**Mean**

Mean is defined as the ratio of sum of observations to total number of observations.

\[Mean=\frac{Sum\,of\,observations}{Total\,number\,of\,observations}\]

**Example:**

Find the mean of first five even natural numbers.

**Solution: **First five even natural numbers are 2, 4, 6, 8,10

From the above formula, we get

Mean\[=\frac{2+4+6+8+10}{5}=\frac{30}{5}=6\]

*play_arrow*Introduction*play_arrow*Mean*play_arrow*Median*play_arrow*Mode*play_arrow*Bar Graph*play_arrow*Histogram*play_arrow*Data Handling*play_arrow*Data Handling & Graphs*play_arrow*Data Handling

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