Use the following dot plot to answer the questions. what is the mean of the set? if an additional dot is added to the set in the 3 column, how will the mean change? what will the new mean be?

Hello!

to find mean, you have to add all the amounts together and divide by how many numbers there are.

1 + 1 + 2 + 2 + 3 + 3 + 3 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 51

there are 16 dots

51  ÷ 16 = 3.1875

the mean is 3.188(rounded)

add a "3" to the data set

1 + 1 + 2 + 2 + 3 + 3 + 3 + 3 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = 54

there are 17 dots

54  ÷ 17 = 3.176(rounded)

the mean will decrease. the new mean is 3.176(rounded)