Saturday
November 22, 2014

Homework Help: Alegebra

Posted by Jessi on Friday, September 11, 2009 at 5:27pm.

Can some one please help me with this 3 problems I have a hard time with probabilities I'm studying for my mid-term. Thank you

1) Urn A has balls numbered 1 through 7. Urn B has balls numbered 1 through 5. A ball is selected at random from urn A and then a ball is selected at random from urn B. What is the probability that a 4 is drawn from A followed by a 2 from B?

2)Mark can remember only the first 5 digits of his friendís phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark were to dial all of the possible numbers and if it takes him 20 seconds to try each one, how long would it take to try every possibility?

3) A contractor is considering a sale that promises a profit of $20,000 with a probability of .7 or a loss (due to bad weather, strikes, and such) of $3,000 with a probability of .3. What is the expected profit?

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