Plus One Maths Notes Chapter 15 Statisticsis part of Plus One Maths Notes. Here we have given Kerala Plus One Maths Notes Chapter 15 Statistics.

Board | SCERT, Kerala |

Text Book | NCERT Based |

Class | Plus One |

Subject | Maths Notes |

Chapter | Chapter 15 |

Chapter Name | Statistics |

Category | Plus One Kerala |

## Kerala Plus One Maths Notes Chapter 15 Statistics

**Measures of Central Tendency **

**Arithmetic mean:**

- For ungrouped (raw) data, the mean of x
_{1},x_{2},…………………x_{n}is

- For grouped data (frequency table)

**Median:**

(1) For raw data, median is obtained by first arranging the data in ascending or descending order and applying the following rule

- If the number of observations is odd,then the median is observation.
- If the number of observations is even, the median is the mean of and

observations.

(2) For frequency table, median class the class in which the observation lies,

l= lower limit of the median class

f_{1} = frequency of the median class

f_{0} = cumulative frequency of the class preceding the median class

c = width of the class interval

N = total frequency

- Mean deviation for grouped data

- Variance and standard deviation for ungrouped data

- Variance and standard deviation for discrete frequency distribution.

- The distribution having greater C.V. has more variability around the central value than the distribution having smaller value of the C.V.
- Less the C.V. more consistent is .the, data.
- For distributions with equal means, the distribution with lesser standard deviation is more consistent or less scattered.

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