ant101

Oh, thank you, CPhill! I totally forgot about the -5!

Hmm, if you match both equations... Let's see what CPhill says.

Wait, how about if you equal 2b=4, so b=2. It will be better if you match both sides! Also, 2ax=3x, x will cancel, thus 2a=3, a=3/2. Therefore, 3/2+2=7/2.

YAY! I got it! Phew, I did it! Thank you!

That's what I did! How do you proceed from there, though?

is it 5/7?

We can first find the mean, which is 80/10=8.

Now, for each number: subtract the Mean and square the result!

So, (15-8)^2, (8-8)^2, (14-8)^2, (7-8)^2, (6-8)^2, (8-8)^2, (2-8)^2, (8-8)^2, (9-8)^2, (3-8)^2

Which is, 49, 0, 36, 1, 4, 0, 36, 0, 1, 25

Now, find the mean, which is 49+0+36+1+4+0+36+0+1+25/10=15.2!

First, create six spots for your number and label them 100000x, 10000y, 1000z, 100x, 10y, z. Add everything up, and see what you can do from there! 

Thank you so much, CPhill!

Thank you, CPhill! I understand it better, now!