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shepuryov [24]
3 years ago
9

A city council consists of six democrats and five republicans. If a committee of seven people is selected, find the probability

of selecting four Democrats and three republicans.
Mathematics
1 answer:
Mamont248 [21]3 years ago
7 0
Use hypergeometric distribution where there are two categories of identical objects/persons, each with a know size.
d=number of Democrats selected
D=total number of Democrats = 6
r=number of Republicans
R=total number of Republicans =5
Then 
P(d,r)=\frac{C(D,d)C(R,r)}{C(D+R,d+r)}
where 
C(n,r)=\frac{n!}{(n!(n-r)!)}  = combination of r items selected from n,
D+R=total number of members = 6+5 =11
d+r=number of members selected = 7

P(d,r)=\frac{C(D,d)C(R,r)}{C(D+R,d+r)}
P(4,3)=\frac{C(6,4)C(5,3)}{C(6+5,4+3)}
=\frac{C(6,4)C(5,3)}{C(11,7)}
=\frac{15*10}{330}
=\frac{5}{11}

Answer: the probability of selecting 4 Democrats and 3 Republicans is 5/11

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These probabilities are computed as 1 over all the possible outcomes.

(a) If you want a heart card and a five, you want the 5 of hearts. So, only one card would satisfy your request, and thus you have probability 1/52 of dealing the 5 of hearts.

\dfrac{1}{52}\approx 0.019 = 1.9\%

(b) There are four 10s and four Jacks in the deck, so 8 cards satisfy your request. With probability 8/52, you'll be dealt a Jack or a 10.

\dfrac{8}{52}=\dfrac{2}{13}\approx 0.154 = 15.4\%

(c) You have two "good" outcomes out of 5, so your probability is 2/5.

\dfrac{2}{5}=0.4=40\%

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suppose that the current canadian dollar to US dollar exchange rate is 0.80 CAD = $1 US and that the U.S. dollar price of an App
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Step-by-step explanation:

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Mathematically speaking:

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Feel free to ask for more if needed or if you did not understand something.

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3 years ago
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Ostrovityanka [42]

ANSWER: ∠T = 32.4°

Remember the formula for the basic trig functions: SOH CAH TOA

Since you want to find cosine for <T, you need the adjacent side length as well as the hypotenuse's length which can be found using the Pythagoras's Theorem  a^2+b^2=c^2 with <em>a </em> and <em>b</em> being the side lengths and <em>c</em> being the hypotenuse.

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