Yo yo! I hope everyone's got something exciting going on today for the big game. I just sent an email answering a couple questions about the homework, and thought it might be helpful for everyone, so check it out...
They (the problems) are a bit different, but that's b/c I want you to have some challenge! For the rainfall problem, if you're just talking about one year, you use the standard deviation given. However, once we start talking about 4 years (I think in c,d) you need to then use the new standard deviation formula for teh sampling distribution of means. That's the key to which formula you use--once you start taking more than one sample (year), you have to use the new formula. So 26 is a little bit of everything.
Yes, for both you should check the conditions and show your work written out.
For 36b, it's a flashback to probability. In A you found the probability that a bag is underweight--so for b, think about "ands" and "or's." We have 3 bags--so, "not underweight and...." Think about it.
Good luck!
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