So them my Q1 would have been a 69, and looking at only the 5 observations above, my Q3 would have been the 78 just so you know how the calculations the computers are doing, that's typically the method of using it sometimes they specifically take .25 times the sample size to find the position of that 25th observation or 25th percentile, and even interpolate, but this is method that most calculators and computers use. 