User manual TEXAS INSTRUMENTS TI-25X

[. . . ] That is, the statistics register contains data. A number and operation are stored as a constant. A number other than zero is stored in memory. You must press - or + to clear the error. 2. ENG Scientific Notation In scientific notation, a number is expressed as a mantissa multiplied by 10 raised to a power (exponent). mantissa exponent floating mantissa sign exponent sign Key a `\ Function Example: To enter 1. 2345 × 10 6: 1. 2345 a 6 1. 2345 06 Removes a displayed result from scientific notation and displays it in standard decimal format. Entering a Number in Scientific Notation 1. [. . . ] You can store a number in memory for repeated use in a calculation or to keep a running total. Key r Function Stores the displayed number in memory, replacing any previously stored number. To clear the memory, press r when zero is displayed. Recalls and displays the number stored in memory. Does not change or clear the number in memory. Adds the displayed number to the current number in memory. Does not affect the displayed number or any calculation in progress. Swaps the number in memory with the displayed number. The displayed number is stored, and the previously stored number is displayed. u M 15. s t u Note: + clears the memory. - does not clear the memory. 7. ENG Constant Calculations The constant key h simplifies repetitive calculations by storing a number and its associated operation for repeated use. Key mph moh mnh mmh mZh Function Adds m to each subsequent entry. Raises each subsequent entry to the mth power. m ` l h Takes the mth root of each subsequent entry. After storing the constant, you can complete each repeated calculation by simply entering the new number and pressing l. To erase the constant, clear the calculator or enter any of the above arithmetic keys. 8. ENG Angle-Unit Setting Before starting a trigonometric calculation, use the K key to select the appropriate angle-unit setting (D—Degree, R—Radian, or G—Grad). Key K `x Function Changes the angle-unit setting without affecting the displayed angle value. Changes the angle-unit setting and converts the displayed angle value to its equivalent for the new setting. (If necessary, press K until D is displayed. ) 45 D 45. `x D 45. Trigonometric Functions Key W, X, Y Function Calculates the sine, cosine, or tangent of the displayed angle. Example: 90 W o 30 X l 0. 1339746 Calculates arcsine, arccosine, or arctangent of the displayed value. Example: 1 ` u 90. ` u, ` v, `w 9. ENG Degree Format Conversions An angle measured in degrees, minutes, and seconds (DMS) must be converted to decimal degrees (DD) before you can use it in a calculation. [. . . ] Assume that the four students are the entire population: 96, 81, 87, 70. Comments Clear display Clear register 1st entry 2nd entry 3rd entry (incorrect) 3rd entry (removed) 3rd entry (correct) 4th entry Mean (class average) Standard Deviation Variance Keystrokes ` [CSR] 96 g 81 g 97 g 97 ` z 87 g 70 g ` `ƒ V Display 0. 83. 5 9. 4472218 89. 25 Important: Remember to press ` [CSR] to clear the statistics register and return to arithmetic calculations. 14. ENG Error Conditions The display shows E when an error occurs or when you attempt certain operations. If the digits fail to appear on the display: ¦ ¦ Check to be sure that no part of the solar panel is covered. [. . . ]