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Math Help - who can answer any of these

  1. #1
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    who can answer any of these

    find each of the following probabilities for a normal distribution:
    a. p(z>-1.00)
    b. p(z>-0.80)
    c. p(z<0.25)
    d. p(z<1.25)

    for a normal distribution idenitfy the z-score location that would seperate the distriubtion into two sections so there is:
    a. 70% in the body on the right-hand side.
    b. 80% in the body on the right-hand side.
    c. 75% in the body on the left-hand side.
    d. 90% in the body on the left-hand side.


    information from the dmv induicates the average of licensed drivers is mean- 39.7 and standard deviation of o- 12.5 years. assume that the distriubtion of drivers age is approx. normal.

    a. x=85
    b.x= 92
    c. x=78
    d. x=72
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by sf415415 View Post
    find each of the following probabilities for a normal distribution:
    a. p(z>-1.00)
    b. p(z>-0.80)
    c. p(z<0.25)
    d. p(z<1.25)

    for a normal distribution idenitfy the z-score location that would seperate the distriubtion into two sections so there is:
    a. 70% in the body on the right-hand side.
    b. 80% in the body on the right-hand side.
    c. 75% in the body on the left-hand side.
    d. 90% in the body on the left-hand side.


    information from the dmv induicates the average of licensed drivers is mean- 39.7 and standard deviation of o- 12.5 years. assume that the distriubtion of drivers age is approx. normal.

    a. x=85
    b.x= 92
    c. x=78
    d. x=72
    Using the fact that for the standard normal distribution:

    F(-x)=1-F(x)

    and for an arbitary normal distrbution that:

    z=\frac{x-\mu}{\sigma}

    has a standard normal distribution, you will find the answers to all your problems here.

    (and the last question as it is makes no sense)

    RonL
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