The mean of the answer is 20.5 because you add all of the number together and divide by 6 because there's 6 numbers.
I'm sorry, but I don't know how to do the standard deviation...
Hope this helped!
Answer:
c
Step-by-step explanation:
Step-by-step explanation:
Numbers: 330, 440, 550, 660 and so on all the way to 990
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