What do you think about data set if standard deviation to be zero?

Step-by-step explanation:

all elements of the data set have the same value. therefore there is no difference of the individual values to the mean value.

and the sum of these differences is therefore also 0.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

8

step-by-step explanation: