I was sick recently, and missed two days of class. Out of 35 problems, I got stuck on these 7:
In a large experiment to determine the success of a new drug, 500 patients with a certain disease were given the drug. If more than 340 but less than 385 patients recover, the drug is considered 73%...
Would it be this equation:
http://en.wikipedia.org/math/3/d/e/3de06a58c468e1a52640305d53393a20.png
With lambda equaling 8 and k equaling 6? Actually, with the number of customers being fewer than 7, would I multiply that equation for k being from 0 to 6?
For 7 out of 10 hours, p^7 * (1-p)^3 *...
a) The table says "Critical Values for T Distributions"...don't really know what that is.
b) Is (a) even possible to figure out?
c) Yeah, but I don't know the probability of less than 7. Isn't the negative binomial the thing that counts the number of failures to get a success?...Oh wait, would...
Customers arrive at a checkout counter at a department store an average of 8 times per hour. Twenty percent of them are buying things from section A of the store.
a) Find the probability of getting fewer than seven customers at the checkout counter in one hour.
How are supposed to know...
If you have a problem that involves some distribution, how do you know which one to use? The ones we covered so far are:
Binomial
Negative Binomial
Hypergeometric
Poisson Distribution
Poisson Process
I'm taking 6 classes and working. There are some things I just don't care about, this happens to be one of them. As for the second part, I got:
5C3 x 5C4 + 5C4 x 5C3 + 5C5 x 5C2
The teacher actually didn't grade the tests. A teaching assistant did. Partial credit was supposed to be given, but...
It was a test question. It's posted exactly. How I answered them was what I typed before the ? Those are wrong, though, because I got a big red X through it and -10 on that question. There's no explanation as to why it was wrong.
Is it supposed to be 10C7?
Alright, I have no idea. If we go really small and just go for 2 from the first 3, that is:
AB
AC
BC
3. 3 questions, choose 2 is 3.
3! is 6. Divide by 2! (2) is 3. That doesn't seem right.
I don't even know what 3 choose 2 is, but I am guessing that isn't right either. I looked up...
You are taking a test with 10 questions, you only have to answer 7, how many ways are there to do it?
10 x 9 x 8 x 7 x 6 x 5 x 4 ?
How many different ways are there to answer the questions if you must answer at least 3 from the first 5 questions?
5 x 4 x 3 x 7 x 6 x 5 x 4 ?
1) The board of directors of a pharmaceutical corporation has 10 members. An upcoming stockholder's meeting is scheduled to approve a new slate of company officers (chosen from the 10 board members).
A) 4 (Presendent, Vice Presendent, secretary, and treasurer) positions needs filled. How many...