Clearing Memories - HP 20b Instruction Manual

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HP 20b Using Memories to Solve Problems
This screen indicates that memory 1 has the value of 0.00 presently stored in it. You can press < or > to scroll
through the ten memory registers. Note as well that INPUT is active in the top right of the display. This indicates that if
you key in a value and press I, that value will be stored into the memory register displayed, replacing any value
previously stored there.
If you press < or > enough times, you will eventually see, in addition to the contents of memories 0 through 9,
menu options reporting how many of the available 50 slots for cash flow and statistical data values remain, as well as the
number of statistical data values presently stored and the number of cash flow values stored.

Clearing memories

To clear all data memories at once, press :x. and then < or > until you see the display shown below in
figure 2. At this display, pressing I will reset all ten data memories to a value of 0. The message "Memory Reset"
will be scrolled across the screen.
Practice using registers to solve problems
Example 4: The sales price of the last 10 homes sold in the Parkdale community were: $198,000; $185,000;
$205,200; $225,300; $206,700; $201,850; $200,000; $189,000; $192,100; $200,400. What is the average
of these sales prices?
Solution: Register R
display. The average is computed using the following expression,
In this example, n is 10 (ten) and d
average is obtained by dividing the total accumulated by the number of entries. Be sure to initialize the
contents of R
0:$0
Now, each sales price is typed in and added to the existing amount in R
198000:$+0
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will be used to perform all operations. Then the resulting value will be brought back to the
0
n
before starting the problem:
0
∑
d
=
n
x
n
is each sales price. So, all values are accumulated in R
- 4 -
Figure 1
Figure 2
Figure 3
:
0
HP 20b Using Memories to Solve Problems - Version 1.0
and then the
0