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Example: Prices of CDs.
The following data values are the prices of the same popular CD sold from ten different discount
stores.
12.95, 14.90, 11.57, 14.65, 17.95, 21.25, 12.95, 20.35, 10.95, 25.05
Press the STAT key.
Press the number 1 key.
Enter the data values into L1.
Press the STAT key.
Press the ► key to highlight CALC.
Press the number 1 key to select 1-Var Stats.
Press the 2
nd
key and then the number 1 key to get L1.
Press the ENTER key.
You have to tell the calculator which list you want to use for the computations. If you omit the
name of the list, 1-Var Stats uses L1 as its default.
The output screen contains many results. You will need to use the down arrow key to see all of
them. Let’s go through the output line by line.
• Ë is the sample mean of the data.
• Σx is the sum of the values in the data set.
• Σx
2
is the sum of the squares of the values.
• Sx is the sample standard deviation.
• σx is the population standard deviation.
• n is the number of values in the data set.
• minX is the smallest value in the data set.
• Q
1
is the first quartile.
• Med is the median of the data set.
• Q
3
is the third quartile.
• maxX is the largest value in the data set.
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