36*.42=
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25x80 < 28x87 < 30x90 --> 2000 < 28x87 < 2700?
It helps by finding the product of 3
== ==
You can't estimate std dev by eye; use the range rule of thumb which is: std dev = range/4.
… well first you add up the numbers then you divide by the amount there are. Since you are dumb I'll give you an example. Ok so say you have 3 cats. One cat weighs 8 pounds. The next cat weighs 6 pounds, and the next cat weighs 10 pounds. So all together that's 24 pounds. Now divide that by 3 (because that's the amount of cats). The range of the weight of all three cats is 8 pounds. :)