What is the mean of the data set?

85, 97, 84, 88, 95, 100, 81
19
83
88
90

The answer is 90.
What you do is you add up all the data and then divide it by how many sets there are. So you would add up the numbers and get 630 and then you would divide it by 7. Which would get you 90. Hope this helps :)

Option D  "90"

Step-by-step explanation:

The answer is provided as a whole explanation

Step-by-step explanation:

Regrouping is the presentation of a number or decimal with its number groups. For example, we can represent 0.25 in this way:

0.25 = 0.2 + 0.05

0.25 = 2 tenth + 5 hundredth  

We can also write 0.25 as:

0.25 = 0.1 + 0.15

0.25 = 1 tenth + 15 hundredth

Regrouping is handy to simplify a mathematical calculation since we know how many tenth or hundredth we have got in this case.