Calculate the mode median mean quartiles and standard deviation. The mode is the number that is repeated more often than any other so 13 is the mode. In everyday language the word average refers to the value that in statistics we call arithmetic mean When calculating arithmetic mean we take a set add together all its elements then divide the received value by the number of elements.
To find the mean add up all the numbers and divide by the number of numbers.
The largest value in the list is 21 and the smallest is 13 so the range is 21 13 8. Mean Median and Mode Introduction Measures of central tendency or averages are used in a variety of contexts and form the basis of statistics. The term central tendency refers to the middle or typical value of a set of data which is most commonly measured by using the three ms. The median is the middle number of a dataset.