Casio fx 991MS User Guide - Page 29

Population Standard Deviation (σn) = 1.316956719 Arithmetic Mean (o) = 53.375 Number of Data (n) = 8 Sum of Values (Σx) = 427 Sum of Squares of Values (Σx2) = 22805 A X 2 = A X 1 = A U 3 = A U 2 = A U 1 = Data Input Precautions • S S inputs the same data twice. • You can also input multiple entries of the same data us- ing 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 calcula- tor 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. Ed i t OFF ESC 1 2 27