HP 35s Scientific Calculator - Manual (Page 267)

Statistics Programs 16-21
Flags Used:
None.
Program Instructions:
1. Key in the program routines; press  when done.
2. Press S to start entering new data.
3. Key in x
i
–value (data point) and press  .
4. Key in f
i
–value (frequency) and press  .
5. Press  after VIEWing the number of points entered.
6. Repeat steps 3 through 5 for each data point.
If you discover that you have made a data-entry error (x
i
or f
i
) after you have
pressed  in step 4, press U and then press  again.
Then go back to step 3 to enter the correct data.
7. When the last data pair has been input, press G to calculate
and display the grouped standard deviation.
8. Press  to display the weighted mean of the grouped data.
9. To add additional data points, press  and continue at step 3.
To start a new problem, start at step 2.Variables Used:
Example:
Enter the following data and calculate the grouped standard deviation.
X Data point.
F Data–point frequency.
N Data–pair counter.
S Grouped standard deviation.
M Weighted mean.
i Index variable used to indirectly address the correct
statistics register.
Register -27 Summation Σf
i
.
Register -28 Summation Σx
i
f
i
.
Register -30 Summation Σx
i2
f
i
.