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anonymous
 5 years ago
In a sample of 26 handheld calculators, 20 are known to be nonfunctional. If 6 of these calculators are selected at random, what is the probability that exactly 4 in the selection are nonfunctional? Round to the nearest thousandth.
A. 0.667
B. 0.316
C. 0.769
D. 0.300
E. 0
anonymous
 5 years ago
In a sample of 26 handheld calculators, 20 are known to be nonfunctional. If 6 of these calculators are selected at random, what is the probability that exactly 4 in the selection are nonfunctional? Round to the nearest thousandth. A. 0.667 B. 0.316 C. 0.769 D. 0.300 E. 0

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Draw a probability tree. I would, but I don;t have the patience, and hate statistics with a passion.

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0I know you have a 76.9% chance of picking one the first time..... but what to do after than I would have to read up on :)

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0I would assume our initial options would lead to these b,b,b,b,b,b b,b,b,b,b,g b,b,b,b,g,g b,b,b,g,g,g b,b,g,g,g,g b,g,g,g,g,g g,g,g,g,g,g

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[\frac{20 \times 19 \times 18 \times 17 \times 6 \times 5}{26 \times 25 \times 24 \times 23 \times 22 \times 21} \times ^6 C_4\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Well I tried that but that doesn't get me close to any of the solutions?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Of course it does, I just told you it.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Do you know what 6C4 means?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[^NC_R \equiv \frac{n!}{n!(nr)!}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes lol sorry I think I just plugged in my calc wrong was all! Thanks a bunch!

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You have to explain to me why that is the answer now, though.

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.020/26; then the odds go to 19/25, then to 18/24 .....

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0My definition of NCR has n! on the bottom when it should be r!, apologies to anyone confused.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well the equation you just gave me is saying the number of combinations of n elements taken r times

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0thats last bit is combinatorical .... i think

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Ya I'm pretty sure it is combinatorical just not positive on how to solve it via the way my book is showing me lol

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Sort of  You need to pick 4 non functioning, and 2 functioning. The first one gives you the overall odds of each in turn, and the second gives you the different orders you can do it in.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0uh ok I'm confused again.... Can you show me on http://www.dabbleboard.com/draw?b=Guest644716&i=0&c=3327a9e1158d904a38fbad735c24ed28cad7bcd9

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0No, sorry, I have stuff to do. Draw a probability tree.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ok Thanks for helping though! Much appreciated... I'll mess around with it until I figure it out:)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0amistre64....what were you trying to say when you posted...20/26; then the odds go to 19/25, then to 18/24? if I keep working my way down what does that do?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0amistre64....what were you trying to say when you posted...20/26; then the odds go to 19/25, then to 18/24? if I keep working my way down what does that do?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Let's say you choose FFFFNN, the odds are: (20/26 x 19/25 x 18/24 x 17/23) x (6/22 x 5/21) However, you could actually do this in any order, so you have to multiply it by 6C2
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