Which data set is most spread from its mean?

26, 6, 20, 36
28, 15, 30, 15
49, 17, 4, 18
14, 20, 24, 30

Will give brainliest series to sigma notation write the following series in sigma notation. 6+10+14+18+22+26+30 example image shown below.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

What is 140% of 25? because i need