Bell Curve in MS Excel With Only Three Numbers (25%tile, 50%tile, and 75%tile)
Posted on 2015-01-20
Hi, Can somebody detail how to create Bell Curve charts in MS Excel 2013 when given only three sets of #s - the 25th percentile numbers, the 50th percentile numbers, and the 75 percentile numbers ? Based on a Z-table of entries the 25th percentile is at -.67 standard deviations and the 75th percentile is at .68 standard deviations from the mean (if I am reading this correctly, I am a bit rusty at this though). The goal is to create the Bell Curve charts in order to determine what the 90th percentile scores or what any other percentile scores would be when given the 25th, 50th, and 75th percentile scores (that is to say, have the Bell Curve charts complete the scale based on the given 25th, 50th, and 75th percentile inputs). TIA ...