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Pressing the t key at this point returns to the coefficient input screen. • Certain coefficients can cause calculation to take more time. • Example 1: To solve the equation x3 – 2x2 – x + 2 = 0 (x = 2, –1, 1) (Degree?) 3 (a?) 1 = (b?) D 2 = (c?) D 1 = (d?) 2 = (x1 = 2) ] (x2 = –1) ] (x3 = 1) • If a result is a complex number, the real part of the first solution appears first. This is indicated by the “R-I” symbol on the display. Press A rto toggle the display between the real part and imaginary part of a solution. 23 x1= R.I 0.25 A r R.I x1= 0.75i • Example 2: To solve the equation 8x2 – 4x + 5 = 0 (x = 0.25± 0.75i) (Degree?) 2 (a?) 8 = (b?) D 4 = (c?) 5 = (x1 = 0.25 + 0.75i) ] (x2 = 0.25 – 0.75i) k Simultaneous Equations Simultaneous Linear Equations with Two Unknowns: a1x + b1y = c1 a2x + b2y = c2 Simultaneous Linear Equations with Three Unknowns: a1x + b1y + c1z = d1 a2x + b2y + c2z = d2 a3x + b3y + c3z = d3 Entering the EQN Mode displays the initial simultaneous equation screen. Un k now ns? 2 3 Use this screen to specify 2 or 3 as the number of unknowns, and input values for each of the coefficients. Arrow indicates direction you should scroll to view other elements. 0. a1? Coefficient name Element value 24 •Any time until you input a value for the final coefficient (c2 for two unknowns, d3 for three unknowns), you can use the [ and ] keys to move between coefficients on the screen and make changes, if you want. • Note that you cannot input complex numbers for coefficients. Calculation starts and one of the solutions appears as soon as you input a value for the final coefficient. 0. x= Solution Variable name Arrow indicates direction you should scroll to view other solutions. Press the ] key to view other solutions. Use [ and ] to scroll between all of the solutions for the equation. Pressing the t key at this point returns to the coefficient input screen. • Example: To solve the following simultaneous equations 2x + 3y – z = 15 3x – 2y + 2z = 4 5x + 3y – 4z = 9 (x = 2, y = 5, z = 4) (Unknowns?) 3 (a1?) ....... (d1?) 2 = 3 = D1 = 15 = (a2?) ....... (d2?) 3 = D 2 = 2 = 4 = (a3?) ....... (d3?) 5 = 3 = D 4 = 9 = (x = 2) ] (y = 5) ] (z = 4) 25 SD REG Statistical Calculations SD REG Statistical Calculations Standard Deviation SD Use the F key to enter the SD Mode when you want to perform statistical calculations using standard deviation. SD .................................... F 2 (fx-95MS) F F 1 (Other Models) •Always start data input with A B 1(Scl) = to clear statistical memory. •Input data using the key sequence shown below. S •Input data is used to calculate values for n, .x, .x2 , o, .n and .n-1, which you can recall using the key operations noted nearby. To recall this type of value: Perform this key operation: .x2 .x n o .n .n-1 A U 1 A U 2 A U 3 A X 1 A X 2 A X 3 • Example: To calculate .n1, .n, o, n, .x, and .x2 for the following data : 55, 54, 51, 55, 53, 53, 54, 52 In the SD Mode: A B 1(Scl) = (Stat clear) SD 55 S n= 1. Each time you press S to register your input, the number of data input up to that point is indicated on the display (n value). 54 S 51 S 55 S 53 S S 54 S 52 S Sample Standard Deviation (.n1) = 1.407885953 A X 3 = 26 Population Standard Deviation (.n) = 1.316956719 A X 2 = Arithmetic Mean (o) = 53.375 A X 1 = Number of Data (n) = 8 A U 3 = Sum of Values (.x) = 427 A U 2 = Sum of Squares of Values (.x2) = 22805 A U 1 = Data Input Precautions • S S inputs the same data twice. •You can also input multiple entries of the same data using A G. To input the data 110 ten times, for example, press 110 A G 10 S. •You can perform the above key operations in any order, and not necessarily that shown above. •While inputting data or after inputting data is complete, you can use the [ and ] keys to scroll through data you have input. If you input multiple entries of the same data using A G to specify the data frequency (number of data items) as described above, scrolling through data shows both the data item and a separate screen for the data frequency (Freq). •You can then edit the displayed data, if you want. Input the new value and then press the = key to replace the old value with the new one. This also means that if you want to perform some other operation (calculation, recall of statistical calculation results, etc.), you should always press the t key first to exit data display. •Pressing the S key instead of = after changing a value on the display registers the value you input as a new data item, and leaves the old value as it is. •You can delete a data value displayed using [ and ] by pressing A U. Deleting a data value causes all values following it to be shifted up. • Data values you register are normally stored in calculator memory. The message “Data Full” appears and you will not be able to input any more data if there is no memory left for data storage. If this happens, press the = key to display the screen shown below. 1 2 Ed i t OFF ESC 27 Press 2 to exit data input witho...

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