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Math Help - I don't get these questions... x_x

  1. #1
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    I don't get these questions... x_x

    Sorry for plaguing you guys with questions lately. But the teacher won't let me drop the advanced maths classes until next term. :[

    c. Explain why the distribution of the Z variable is normal, with a mean of 0 and a standard deviation is 1.

    (Do I say something like, "We needed to solve a value to standard deviations?")

    d. Calculate Pr(Z>1.4) [By the way, the > has an underline underneath it]

    (What do I calculate it with? What's the probability that I'm supposed to calculate with? I don't get it...)

    e. Calculate k if Pr(Z<k) [Again, the < has an underline.]

    (And again, I don't get it D
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  2. #2
    Senior Member
    Joined
    Feb 2008
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    Berkeley, Illinois
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    Quote Originally Posted by Hikaru View Post
    Sorry for plaguing you guys with questions lately. But the teacher won't let me drop the advanced maths classes until next term. :[

    c. Explain why the distribution of the Z variable is normal, with a mean of 0 and a standard deviation is 1.

    (Do I say something like, "We needed to solve a value to standard deviations?")

    d. Calculate Pr(Z>1.4) [By the way, the > has an underline underneath it]

    (What do I calculate it with? What's the probability that I'm supposed to calculate with? I don't get it...)

    e. Calculate k if Pr(Z<k) [Again, the < has an underline.]

    (And again, I don't get it D
    Question D: You want to calculate the probability of a Z-Score. 1.4 is your Z-Score.

    Go here for the math:
    Probability of a Random Variable in the Normal Distribution

    Press P(X>Z) and then enter 1.4 where it tells you to and press Calculate Normal Distribution Probability.

    Also, you can use Excel: =1-NORMDIST(1.4,0,1,TRUE)

    We do 1 - because that covers the area of curve from the far left region all the way up to your z-score. So you want everything after that.

    Following that logic for e, your answer is 1 - P(Z<k)

    Read up more on Z-scores for the business sense of things.
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