Statistics ISC Class-11 Maths ML Aggarwal Solutions Chapter-1. Step by step Solutions of ML Aggarwal ISC Class-11 Mathematics with Exe-1.1, Exe-1.2, Exe-1.3, Exe-1.4, Exe-1.5, and Chapter Test Questions. Visit official Website CISCE for detail information about ISC Board Class-11 Mathematics.

## Statistics ISC Class-11 Maths ML Aggarwal Solutions Chapter-1

Board | ISC |

Class | 11 |

Subject | Mathematics |

Cha-1, Sec-C | Statistics |

Session | 2024-25 |

Topics | Solutions of ML Aggarwal |

**Statistics**

**Measure of Dispersion: **The dispersion is the measure of variations in the values of the variable. It measures the degree of scatteredness of the observation in a distribution around the central value.

**Range: **The measure of dispersion which is easiest to understand and easiest to calculate is the range.

Range is defined as the difference between two extreme observation of the distribution.

Range of distribution = Largest observation – Smallest observation.

**Mean Deviation:**

Mean deviation is the basic measure of deviations from value, and the value is generally a mean value or a median value. In order to find out the mean deviation, first take the mean of deviation for the observations from value is d = x – a Here x is the observation, and a is the fixed value.

The basic formula to find out the mean deviation = Mean Deviation = Sum of absolute values of deviations from ‘a’ / Number of observations

**Mean Deviation About Median:**

To find the mean deviation about median for the given discrete frequency distribution. First arrange the observation in ascending order to get cumulative frequency which is equal or greater than N/2, where N is the sum of the frequencies.

**Mean Deviation for Ungrouped Data:**

Calculation of mean deviation for ungrouped data involves the following steps :

Let us assume the observations x_{1}, x_{2}, x_{3}, …..x_{n}

**Step 1:** Calculate the central tendency measures about to find the mean deviation and let it be ‘a’.

**Step 2**: Find the deviation of x_{i }from a, i.e., x_{1} – a, x_{2}– a, x_{3} – a,. . . , x_{n}– a

**Step 3: **Find the absolute values of the deviations, i.e., | x_{1} – a |, | x_{2}– a |, |x_{3} – a|,. . . ,|x_{n}– a| and the drop the minus sign (–), if it is there,

**Mean Deviation for Grouped Data:**

The data can be grouped into two ways namely,

- Discrete frequency distribution
- Continuous frequency distribution

The methods of finding the mean deviation for both the types are given below

**Exe-1.1**

Statistics ISC Class-11 Maths ML Aggarwal Solutions Chapter-1

**Exe-1.2**

Statistics ISC Class-11 Maths Solutions Chapter-1

**Exe-1.3**

Statistics ISC Class-11 Maths

**Exe-1.4**

Statistics ISC Class-11 Maths Solutions Chapter-1

**Exe-1.5**

Statistics ISC Class-11 Maths Chapter-1

**Chapter Test**

Statistics ISC Class-11 Maths ML Aggarwal Solutions Chapter-1

**-: End of Statistics ISC Class-11 Maths ML Aggarwal Solutions Chapter-1**** :-**

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