Probability help

fuyu1993

New member
Joined
Nov 4, 2013
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1
I have two question that I don't get. Please help.


1. Students in grades 9 to 12 are chosen at random and asked whether they are
studying a language other than English. Here is a distribution of the results:


Language Spanish French German All others None
Probability 0.26 0.09 0.03 0.03 0.59
(a) Explain why this is a legitimate probability model.
(b) What is the probability that a randomly chose student is studying a language
other than English?
(c) What is the probability that a randomly chosen student is studying French,
German, or Spanish?


2. You have three pairs of shoes (black, grey, tan) in your closet, and unfortunately
the closet light is not working so you have to choose two shoes at random.
(a) Write down all possible outcomes (tree diagram). Here are four to start with
(where L=left, R=right)
S = BLBR; BLGL; BLGR; BLTL;
(b) Find the probability that you choose a matching pair. Then find the probability
that the shoes are different colors. (Hint: How are these questions related?)
 
I have two question that I don't get. Please help.

Exactly where are you lost?

1. Students in grades 9 to 12 are chosen at random and asked whether they are
studying a language other than English. Here is a distribution of the results:


Language ...Spanish...French...German...All others.....None
Probability... 0.26....... 0.09...... 0.03........ 0.03 .......0.59
(a) Explain why this is a legitimate probability model.
(b) What is the probability that a randomly chose student is studying a language
other than English?
(c) What is the probability that a randomly chosen student is studying French,
German, or Spanish?


2. You have three pairs of shoes (black, grey, tan) in your closet, and unfortunately
the closet light is not working so you have to choose two shoes at random.
(a) Write down all possible outcomes (tree diagram). Here are four to start with
(where L=left, R=right)
S = BLBR; BLGL; BLGR; BLTL;
(b) Find the probability that you choose a matching pair. Then find the probability
that the shoes are different colors. (Hint: How are these questions related?)
Please share your work with us .

If you are stuck at the beginning tell us and we'll start with the definitions such as "what is commisson"?"

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