AP Problem Tips

2004 #3:
a.) Think about those 3 conditions we have for a Binomial model. If you really had 20 dinosaur bones, assuming male/female are equally likely, what's the probability of a male on the first pick? The second? The third?

b.) Without replacement.

c.) If they were equally likely, then the probability of all males is your answer in (b). Is that going to happen often?

d.) What do you need in a sample to generalize. For example, say I'm testing the average gpa at EHHS so I choose 15 students from AP Stat and 5 students from Gym. Can I generalize these results? Why?

2002 #3:
a.) Any time you see a Normal model, you think "z-score." After you use this to find the probability, sum up your answer in a complete sentence, in context.

b.) Look at your Expected Value/Variance formula sheet. The problem tells us Team = R1 + R2 + R3 + R4......

c.) Use your mean and standard deviation from b....z-scores again!

2002B #2
a.) In which of the cases in the table would all the people get a seat? Think about how many seats there are, and so how many would fit. ___ or ___ ....

b.) If there are 41 tickets sold, and 36 people showed up, how many no showed? Rewrite your probability table with these numbers of no-shows. Then, you got it.

c.) Conditional probability! Use the formula.

2005B #2
a.) You got that.

b.) How would we find T (total tickets)? For instance, if we sold 3 child tickets and 4 adults tickets, we sold 7 total, right? What did we do there? Write an equation...T = ?. Then, back to that old Rosetta Stone sheet of formulas for expected value and variance.

c.) If I sell 2 child tickets at $15, and 3 adult tickets @ $25, I made.....$105, right? How do we get that? Write me an equation for T (total cost) using C (child tickets) and A (adult tickets).