HP HP-18C - Page 103

Example: Statistics calculations. The Wechsler-Ellendman Canal
Boat Shoe Shop had the following phone bills during the past six
months:
Month
Phone
Month
Phone
Expense Expense
1. May
$340
4. August
$780
2. June $175 5. September $245
3. July $450 6. October $625
Calculate the mean, median, and standard deviation of the monthly
phone bills. Then, display the smallest value in the list.
Starting from the MAIN menu:
Keys: Display:
Description:
1IJ!IiII *
Displays the SUM menu .
.1 CLEAR ALL I
Clears the list.
..
.ITEM(l)=
TOTAL=0.00
340 1 INPUT I
ITEM(1)=340.00
Enters May's phone bill.
.ITE~1(2)=
TOTAL=340.00
175 1 INPUT I
ITEM(2)=175.00
Enters June's phone bill.
.ITEM(3)=
TOTAL=515.00
450 1 INPUT I
Enters the phone bills for
780 I INPUT I
July through October .
245 I INPUT I
625 1 INPUT I
ITEM (6) =625.00
.ITEM(7)=
TOTAL=2,615.00
• If you want to preserve the current number list, skip the next step (pressing .1 CLEAR ALL p.
Instead, name the list (refer to page 111), and then press .. lila .
6: Running Total and Statistics Calculations 101