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Here are several ways to get frequency results in Excel for Mac 2011:
(1) Click the Help question-mark-in-a-circle icon, or choose Help > Excel Help from the main menu, and enter Frequency Function. The method described on the FREQUENCY Function help page says (a) type the equals sign and FREQUENCY function with data and bin
range arguments in a single cell A13 and press Return, (b) select the range that will contain the frequency results A13:A16 and press Control+U (but do not press Return), and (c) with A13:A16 still selected, press Command+Z+Return.
The range that will contain the frequency results can have the same number of cells as the number of bin values, or it can have one additional cell that will contain the frequency for values that are greater than the highest bin value.
(2) For a method more similar to Excel for Windows, (a) select the range that will contain the frequency results, e.g., A13:A16, (b) type the equals sign and FREQUENCY function with data and bin range arguments but do not press return, and (c) press Command+Return.
(3) Since a frequency distribution is a necessary step for creating a histogram, choose Help > Search, type Histogram, press Return, click the "I can't find the Analysis ToolPak" item, and follow the instructions for downloading StatPlus:mac LE.
(4) If you would like a histogram that is a little bit better than the simple histograms that use the Excel Column chart type (particularly for continuous-valued data and for proper labeling of the horizontal axis), you could try my free Better Histogram
add-in, available for download from http://betterhistogram.com/free-download