study formula for standard deviation

Standard Deviation of a statistical data is defined as the positive square root of the arithmetic mean of the squared deviations of items from their arithmetic mean of the series under consideration. The standard deviation is denoted b..

of a statistical data is defined as the positive square root of the arithmetic mean of the squared deviations of items from their arithmetic mean of the series under consideration. The standard deviation is denoted by s (sigma). The standard deviatio..

In a study of reaction time (in seconds) to a medicine given to 5 cancer patients, an Oncologist recorded the data 10, 20, 30, 25, 15. Find the standard deviation. => 7.1 or 50 or 20 or 15.81..

Standard Deviation for continuous series - In this series too deviations may be taken either from the actual mean or from standard mean. The calculations will be simplified if the deviation are taken from assumed me..

In this series too deviations may be taken either from the actual mean or from standard mean. The calculations will be simplified if the deviation are taken from assumed me..

Calculation of Standard Deviation for discrete series - In the discrete series, when deviations are taken from actual mean, the formula ..

Merits:..

In a study of mortality rates of 500 tribals in a region, the mean life expectancy was found to be 73 years, with a standard deviation of 6 years. If a sample of 50 tribals is selected at random, then find the probability that their life expectancy is less than 72 year..

In the discrete series, when deviations are taken from actual mean, the formula is: ..

A survey reports that the average coffee consumption of the American adult is over 400 cups per annum. The annual coffee consumption of 25 American adults was subjected to a study and it was found that the sample has a mean of 418 cups and a standard deviation of 10 cu..