Tampons, on the other hand, can block your flow, which can make your period last longer. 5. Many women arenât keen to have sex on their period, but, the truth of the matter is, it can help shorten the length of your period. Sex can effect flow because of orgasmic contractions.
The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.he variance is the mean of these values: and the population standard deviation is equal to the square root of the variance: This formula is valid only if the eight values with which we began form the complete population.
Variance and standard deviation are very closely related. In order to calculate standard deviation, you first need to find variance. Variance is the average squared distance between each data point and the mean. It is given in squared units (e.g. mm 2). Standard deviation is the square root of the variance. It's units are given as basic units of measurement (e.g. mm). Standard deviation represents the âtypicalâ (though not âaverageâ) distance between the mean and the data points in the sample. It can be thought of as measuring the spread of data.