Study material for the quiz this Friday, periods A and D

Some key points you will need to know:

Mean - the average of a set of data. To find the mean first add the sum of the data values. Then divide the sum by the number of data values.

Median - the middle value when the values are arranged in order. If there is no single middle value then the median is the mean of the two middle values.

Mode - the most common data value. If no value occurs more than once, there is no mode. If two or more values occur more than once and equally, there are two or more modes.

Range - the difference between the highest and lowest data values.

Ex. what are the mean, median, mode, and range of the following set of data values: 5,13,7,8,7?

To find the mean first add the values 5 + 13 + 7 + 8 + 7 = 40.
Then divide the sum by 5 since there are 5 values--> 40 / 5 = 8.
Therefore the mean is 8.

To find the median first arrange the data values from least to greatest: 5,7,7,8,13.
Then find the middle value, in this case the middle value is 7 so the median is 7.

To find the mode find the data value that occurs the most often. In this data set 7 occurs the most often so 7 is the mode.

To find the range subtract the smallest value from the largest, in this case you would subtract 5 from 13 ---> 13 - 5 = 8, so the range would be 8.