Question

definitions of arithmetic mean, standard deviation in statistics

Answer 1

the average of a set of numerical values, as calculated by adding them together and dividing by the number of terms in the set.(arithematic mean)
In statistics, the standard deviation (SD, also represented by the Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values.A low standard deviation indicates that the data points tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.

Answer 2

Answer:

Arithmetic mean is the sum of the values of all observations divided by the number of observations.

Standard deviation is the square root of the arithmetic mean of the

squares of deviation of its items from their arithmetic mean.