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00:00 - 00:59 | hello everyone here the question is the mean of 14 observations is 20 and their standard deviation is 5 if the sum of the square of the observations ke then the value of k the present is now let's come to earth solution for hair number of observation so let it represent with and that is it and mean of 14 observations is 27 main is represented to x bar that is 20 and their standard deviation that is represented through Sigma that is 5 so formula of Sigma square is equal to summation XI square divided slash and minus x square Sohail our Sigma is 5 and whole square pipe is 25 is equal to Sigma XI square divided by number of observation that is N is equal to 40 - mean of 14 observations is 20 |

01:00 - 01:59 | square of 2400 so hair this is 25 + 400 is equal to Sigma XI square divided by 4 so from here Sigma XI square is equal to 400 plus 25 is 425 into 40 so from hair value of Sigma XI square is equal to 4 25 into 40 is 17000 and here it is given that sum of square of the observations is ke Sohar this is equal to ke Sohar we can say that value of k is equal to 17000 and we have to find ke bye ke / 2002 hair ke is 17000 and this is cancel out so from here value of k |

02:00 - 02:59 | / thousand is equal to 17 and this is our required answer thank you |

**Introduction with some examples**

**Range**

**Mean deviation for ungrouped data or Individual data with some examples**

**Mean Deviation of a Descrete Frequency Distribution**

**Mean Deviation of a Grouped or Continuous Frequency Distribution**

**Limitations Of Mean Deviations**

**Variance of Individual Observations**

**Variance of a discrete frequency distribution**

**Variance of a grouped or continuous frequency distribution**

**Coefficient of Variation**