HP 12C Platinum Instruction Manual page 4

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HP 12C Platinum Using Memories to Solve Problems
Some remarks about register arithmetic:
1. When one of the registers is going to be used as an accumulator for summations with the use of sequences like
?+ (0 to 4), either the first value must be stored with ? (0 to 4) alone or a zero must be
stored first.
2. When one of the registers is going to be used as an accumulator for products with the use of sequences like
?§ (0 to 4), either the first value must be stored with ? (0 to 4) alone or a one must be stored
first.
3. The sequence ?z (0 to 4) when the display contains a zero causes the message Error 0 to be
displayed (division by zero) and no operation is performed.
Practice using registers to solve problems
Example 3: 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 - HP 12C Platinum Using Memories to Solve Problems - Version 1.0
Figure 6
and then the
0
Figure 7
:
0
Figure 8