It's hard to lead through the logical steps asynchronously.

If the standard deviation was 10, then 50 would be 3 standard deviations away from the mean (10 * 3 = 30)?

Cause if that is right, then I think I understand the first part. Still trying to digest the 2nd part.

Yes, that is correct.

Thank you!

I think I understand now. Going to look at it again in the morning.

Somehow, I don't remember my intro to stat course questions being this... bizarre. :) Then again, my foundation was so poor from the first round that it took second and third rounds to get it firmly cemented into my brain (thanks, o business school for requiring so many stats courses... I actually use it, even when I thought I wouldn't!)

When the teacher turned to gambling, it all made more sense...

Erica, did my explanations make sense (having given them I'm now paranoid about having made a silly mistake).

They made sense to me.

Not to speak for Erica, but I know I was expecting something along the lines of another Stats 100 class (that I tanked) where we had to memorize formulas and learn how to calculate standard deviation, etc... right off the bat. The class specifically says you don't need to learn to calculate a lot of these things since there are programs to do it for you.

In a way, this is a huge relief. In another way, it's still frustrating because my brain doesn't easily work this way and I'm overthinking the questions.

Alex, your answers made sense... I was reflecting on the questions as a whole. I feel that the learning experience can be helped and hampered by using such devices as 'interesting' questions.

But, like I mentioned earlier, the minute I could apply stats to gambling, it was Straight A Central.

I got an 87%. Thank you very much for the help and explanations with those two questions.

Sadly, when I reviewed the work, I have no idea how I got to the conclusions I did with any of the assignments. Which means I have no idea how I am going to remember it for the test.

Do you think the teacher will accept a "Brain is full, it cannot accept any new information" message?

You drove there.

You were going in the right direction with some of your questions by thinking them out first, and I hope some of that comes with you during test time, though I know tests can be more pressured...