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For each dot, write down its number, add them up and divide by the number of dots.
what do you get ?

ok hold on

75?

did you want me to just do the numbers that had a dot on top of them or every single number?

the places with 2 dots means you have that number twice.
the numbers are
50, 76, 78, 79,79, etc

First, what do you get for the total?
then what do you get after dividing by the number of dots?

wait can you tell me what numbers i am using?

yes

77.100 (about)

i used the wplphram calclc

http://www.wolframalpha.com/input/?i=mean+50+76+78+79+79+80+81+82+82+84

ok let me do that hold on

80

so the mean changed from 77 to 80
I got 720/9 = 80 for the second mean

yeah it was right

so you go from 77 to 80
how did the mean change?

no omg i am not think 3

"The mean increases by 3"

yes 80-77 = 3
or
77+3 = 80
increases by 3