Stat 100

[BarTopDancer]

OK, I think I understand part 1.

(80 ± 2 * 6) = (80 ± 12) = (68 to 92) points

The mean is 80. The standard deviation is 6. You have to take the Mean ± 2(SD). So 80 ± 2*6 = the answer.

Part 2.

I have no idea. I am so lost again. I don't even trust that my answer for A is correct anymore.

I think that 3 standard deviations is 18. But you already said C was incorrect for #1.

I'll look at it again in the morning. I appreciate your help.