It is: 2/3 times 3/4 times 80 = 40
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Oh, dude, seriously? Okay, so there are four quarter inches in one inch, right? So, if you have three inches, you just multiply that by four and you get... wait for it... twelve quarter inches. Ta-da! Math wizard over here.
You need more information. there are three components to a rectangle, Length, Width, and Area. you need two of the three to find the third
18, 20 and 22
It is the maximum of the z-coordinate - the third of the ordered triplet.
You arrange the data set in ascending order. You then find the observation such that a quarter of the observations are smaller than it and three quarters are bigger. That value is the lower quartile. Next find the observation such that three quarters of the observations are smaller than it and a quarter are bigger. That value is the upper quartile. Upper quartile minus lower quartile = IQR.