Press the MODE key, and 1(COMP), 2(SD) and 3(REG) will appear, which are the specified calculation modes. COMP is the basic arithmetic operation, SD is the standard deviation, and REG is the regression calculation. Basic arithmetic operations are addition and subtraction multipliers, and sometimes more advanced operations, such as percentage and square root, are included.

The standard deviation calculation mode can do almost all the data of statistical calculation, and the calculation process can be carried out according to the following figure. Of course, you must enter SD mode first, that is, the mode key 2 key enters SD mode. What needs to be added here is that the standard deviation is the standard deviation of the sample.

relevant information

After entering the number and determining the operation symbol, pressing the (%) key will automatically assign the previous parameter as the percentage of its previous parameter participating in the operation. Under Windows7, the percentage cannot directly participate in the operation, but the percentage of the previous operand participates in the operation. The same is true of most mobile phones. For example, 78+2(%) is equivalent to 78+78*2%, and the final result is 79.56.

For example, Nokia. Click it under xp, and the program will multiply the two products and then divide by 100, and display the result. If you enter 23+3 and click "%",the result is 0.69. Enter 23-3, 23/3 or 23*3, and then click%. The result is still 0.69, which means it ignores the sign of addition, subtraction, multiplication and division.