CompTIA Strata *In the event that you fail your first (1st) attempt to pass any CompTIA certification examination, CompTIA does not require any waiting period between the first (1st) and second (2nd) attempt to pass such examination.
See normal distribution for the bell curve in statistics. The Bell Curve is a controversial, best-selling 1994 book by Richard J. Herrnstein and Charles Murray exploring the role of intelligence in American life. The authors became notorious for the book's discussion of race and intelligence in Chapters 13 and 14.
To create a sample bell curve, follow these steps: 1  Start Excel. 2  Enter the following column headings in a new worksheet: 3  Enter the following data in the same worksheet:  Enter the following formulas in the same 1  worksheet: Enter the following formulas to generate the bin range for the histogram: