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Rounding Function (Rnd)
The argument of this function is made a decimal value and then rounded
in accordance with the current number of display digits setting (Norm, Fix,
or Sci).
With Norm 1 or Norm 2, the argument is rounded off to 10 digits.
With Fix and Sci, the argument is rounded off to the specified digit.
When Fix 3 is the display digits setting, for example, the result of 10 ÷ 3 is
displayed as 3.333, while the calculator maintains a value of
3.33333333333333 (15 digits) internally for calculation.
In the case of Rnd(10÷3) = 3.333 (with Fix 3), both the displayed value
and the calculator's internal value become 3.333.
Because of this a series of calculations will produce different results
depending on whether Rnd is used (Rnd(10÷3) × 3 = 9.999) or not used
(10 ÷ 3 × 3 = 10.000).
Example:
To perform the following calculations when Fix 3 is selected for
the number of display digits: 10 ÷ 3 × 3 and Rnd(10 ÷ 3) × 3 (LineIO)
(SETUP)
(Fix)
10
3
(Rnd) 10
3
35
3
3
10.000
9.999
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Questions and answers
How to calculate %RSD and linearity
To calculate %RSD (Relative Standard Deviation) and linearity using the Casio fx-82ES PLUS:
1. %RSD Calculation:
- Enter statistical mode: Press `(MODE)`, then select `2: STAT`.
- Choose `1-VAR` (one-variable statistics).
- Input your data values: Enter each value followed by `(=)`.
- Calculate the mean `(x̄)`: Press `(STAT) → (Var) → (x̄)`.
- Calculate population standard deviation `(σ)`: Press `(STAT) → (Var) → (σ)`.
- Compute %RSD manually: %RSD = (σ / x̄) × 100.
2. Linearity Calculation:
- Enter statistical mode: Press `(MODE)`, then select `2: STAT`.
- Choose `A+BX` (linear regression).
- Enter paired `(x, y)` data: Input `x` values followed by `(=)`, then `y` values followed by `(=)`.
- Compute the correlation coefficient `(r)`: Press `(STAT) → (Reg) → (r)`.
- A correlation coefficient close to 1 or -1 indicates strong linearity.
The calculator does not directly compute %RSD, so you must perform the division and multiplication manually.
This answer is automatically generated