Answer:
https://www.calculator.net/mean-median-mode-range-calculator.html
Step-by-step explanation:
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Here you go, hope it helps!
So, let's make these two values improper fractions so they're easier to work with. 
So, to get the rate he grew in those months we have:
And to get the rate he grew in one month we have to divide both our numerator and our denominator by 21 to get:
aka he grew 1.24 inches in a month.
The relationship between time and amount of popcorn popped is proportional.
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