Solve 8 - 2x / 12 = 2 for x.A. -16 B. -8 C. -4 D. -2
1 answer:
You might be interested in
Answer:
Step-by-step explanation:
First, see if you can group the terms. I will first put this in LaTeX to make it easier to understand. We have , and we can factor a
out of the first group, and a
out of the other group, to get
Let's multiply everything by -1 now to ge t
Multiplying all this does not change it, because -1^2=1.
Because a^2-b^2=(a+b)(a-b), we get out final answer as .
A suitable probability calculator will show that probability to be .135905122.
_____
Your class extends from 1 standard deviation above the mean to 2 standard deviations above the mean. The empirical rule puts that probability at ...
... (1/2)(95% - 68%) ≈ 13.5%
The empirical rule tells you 68% of observations lie within 1 standard deviation of the mean, and 95% lie within 2 standard deviations. Then the number that lie between 1 and 2 standard deviations from the mean will be the difference of these values. You want the values in the region above the mean only, so you only want half the difference just described.
