D. Question 1
Using this data set [10, 12, 13, 15, 11, 12, 9]
What's the mean? (Round to the nearest tenth)

11.7

Step-by-step explanation:

The mean is also called the average.

To find it, you have to add all numbers, and divide by how many numbers there are.

So, when you add all these numbers, you get 82.

Since, there are 7 numbers you divide 82 by 7.

82/7 is 11.7142857.

It says to round to the nearest tenth. Which is the 1st number after the decimal point.

So, the final answer is 11.7.

y = 5x + 17

step-by-step explanation:

a perpendicular line will be the opposite reciprocal slope of the given equation.   the slope given is -1/5 so the opposite reciprocal is 5

find b:

7 = 5 (-2) + b

7 = -10 + b

17 = b

write equation

y = 5x + 17