Technology Appendix - McGraw-Hill Ryerson

Function or TaskCombinationsnCrKeystroke(s), Menu, or ScreenThe TI84+ does not have a dedicated key for combinations. Tocalculate a combination, you will use the nCr functionavailable under the MATH PRB menu.Suppose that you want to evaluate the number of subsets of10 objects taken 7 at a time, or 10 choose 7. Type in 10.Press the MATH key, and then the right arrow key three timesto scroll over to the PRB menu. Select 3:nCr, type in a 7 andpress ENTER. The answer 120 appears.Top MenuFunction or TaskcumSum functioncumSum(listname)Keystroke(s), Menu, or ScreenThe cumSum function returns the cumulative sum of theelements in a list. It is useful for calculating cumulativefrequency for a distribution.Enter the numbers 1,3,5,7,9,11 in L1. Move the cursor to thetop of L2 on top of the list name.Press 2 nd STAT and the right arrow key to access the LISTOPS menu.Select 6:cumSum( and add L1).Press ENTER. You can inspect L2 by pressing STAT andselecting 1:Edit. Your screen looks like this:Top MenuMHR • Mathematics of Data Management Appendix B (Revised 2010) Page 12 of 129