What is the standard deviation of the data set?
9 14 23 15 6 18 27

a. 2.6
b. 3.0
c. 6.8
d. 7.4

the first dot plot best represents the data

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i got 86 for this

hope this !

if you need an explanation just ask

given the equation is 8+9z=-6, the first step would be to subtract the 8 from both sides:

8+9z-8=-6-8

since 8 minus 8 = 0, this would cancel out the 8. and since -6 minus 8 equals -14, the equation would look like this

9z = -14