It may be easier to calculate the mean, median, mode, and range if you rearrange the numbers first.
Mean: 1.5 Median: 1.4 Mode: 1.4 Range: 0.8
Practice makes perfect
The first thing that should be done when finding the key features of a data set is rearranging the numbers from least to greatest.
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1.1 & 1.3 & 1.4 & 1.4 & 1.4 & 1.7 & 1.8 & 1.9
Let's proceed to finding the mean, median, mode, and range.
Mean
The mean of a data set is calculated by finding the sum of all values in the set and then dividing by the number of values in the set. In this case, there are 8 values.
To identify the median, we observe the middle value.
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1.1 & 1.3 & 1.4 & 1.4 & | & 1.4 & 1.7 & 1.8 & 1.9
Dangit! There is no middle value. When this happens, we need to calculate the median by finding the average of the two values closest to the middle. When arranged from least to greatest, the two most central values are both 1.4.
Median=1.4+ 1.4/2=1.4
Mode
The mode of a data set is the value that occurs most frequently.
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1.1 & 1.3 & 1.4 & 1.4 & 1.4 & 1.7 & 1.8 & 1.9
We can see that 1.4 occurs more frequently than any other value in the set, so this is the mode.
Range
The range is the difference between the greatest and least values in a set of data. For our exercise, the greatest value is 1.9 and the least value is 1.1.
Range: 1.9- 1.1=0.8
