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Math Help - I'm not asking for you to do my h/w but...

  1. #1
    Newbie
    Joined
    Aug 2008
    Posts
    12

    I'm not asking for you to do my h/w but...

    1)What is the probability of getting exactly half the questions on a ten question True/False test by guessing?

    A: 63/256 how do you get that answer?

    2)How many ways are there to assign grades of A,B,C,D,E to each of the nine students in a class so that exactly 4 of the students get grades above C.

    A:489,888

    3)How many ways are there to arrange the letters in denounced as follows?
    a) there are no restrictions
    b) the consanants are all adjacent
    c) No two of the vowels are adjacent

    A:
    a)45360
    b)1800
    c)5400

    If anyone has any idea how to arrive at these answers please respond. I have been stuck on these for 2 days now.
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  2. #2
    Member
    Joined
    Oct 2007
    Posts
    145
    1) Use binomial distribution. Just remember that you have to account for all the possible orderings of the correct and wrong answers.

    2) not sure about this...though i was thinking of how to distribute 9 balls into 2 groups of urns, such that one group will always have 4 balls and the other group 5 balls.
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