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Math Help - Could someone check a few problems for me?

  1. #1
    Junior Member Jarod_C's Avatar
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    Could someone check a few problems for me?

    The teacher wants anything that's not a simple fraction to be three significant digits. He also wants to show work. Thanks undefined for checking the last 5. I need to up my grade so I have to ace this one. Thanks for any help. OK here it goes.

    6)From the information provided, create the sample space of possible outcomes.
    Flip a coin three times.

    7)Find the indicated odds.
    If P(A)=5/6 then find the odds against A happening.

    8)Find the indicated probability.
    The probability that Luis will pass his statistics test is 0.37. Find the probability that he will fail his statistics test.

    9)A card is drawn from a well-shuffled deck of 52 cards. What is the probability of drawing a face card or a 3

    10)A card is drawn from a well-shuffled deck of 52 cards. What is the probability of drawing a high card(Ace,King,Queen,Jack) or a 5?

    Here are my anwsers.

    6)HHH,HHT,HTH,HTT,THH,THT,TTH,TTT

    7)If P(A)=5/6 then P(A bar)=1-5/6=1/6

    8)P(E)=.37 so P(E bar)=1-.37=.630

    9)3/52+4/52=7/52=.135

    10)4/52+4/52=8/52=2/13=.154

    I'm also having trouble starting #11, here's the question "Find the probability of correctly answering the first 4 questions on a multiple choice test if random guesses are made and each question has 3 possible answers."

    Thanks ahead of time, you people on here are great, it's much appreciated.

    Edit: would question 11 be \frac {1}{3} \cdot\frac{1}{3} \cdot\frac{1}{3} \cdot\frac{1}{3} ?

    While I'm waiting I thought I'd ask a question, when did the site get a new look. I used to come here for algebra, and trig help now I didn't know it was the same site I spent 15minutes in my favorites trying to find the right place lol.
    Last edited by Jarod_C; July 18th 2010 at 05:39 PM.
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  2. #2
    Senior Member eumyang's Avatar
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    Quote Originally Posted by Jarod_C View Post
    9)A card is drawn from a well-shuffled deck of 52 cards. What is the probability of drawing a face card or a 3

    ...

    9)3/52+4/52=7/52=.135
    There are twelve face cards altogether, three in each of the four suits.

    Quote Originally Posted by Jarod_C View Post
    10)A card is drawn from a well-shuffled deck of 52 cards. What is the probability of drawing a high card(Ace,King,Queen,Jack) or a 5?

    ...

    10)4/52+4/52=8/52=2/13=.154
    Likewise, there are sixteen high cards altogether, four in each of the four suits.
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  3. #3
    Junior Member Jarod_C's Avatar
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    Thanks for the help.

    So on 9) it's 12/52+4/52=4/13=.308

    and on 10) it's 16/52+4/52=5/13=.385

    Do all the other questions look ok?
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