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Math Help - need help solving this probability question.

  1. #1
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    need help solving this probability question.

    Hey again guys.

    The previous question i posted in the forum was already solved, but i have another question.

    how do i solve:

    What is the probability that a randomly selected ping pong ball will have a diameter between 2.28 and 2.30 inches?

    Given: mean 2.3 inches and standard deviation of 0,04 inch.

    Thanks.
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  2. #2
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    What distribution does that question tell you to use?

    If it's the normal distribution, then you need no skill to calculate a probability beyond what you already used to solve the question in your other thread.
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  3. #3
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    Quote Originally Posted by axz92 View Post
    Hey again guys.

    The previous question i posted in the forum was already solved, but i have another question.

    how do i solve:

    What is the probability that a randomly selected ping pong ball will have a diameter between 2.28 and 2.30 inches?

    Given: mean 2.3 inches and standard deviation of 0,04 inch.

    Thanks.
    I assume diameter is a normal random variable.

    Convert D1 = 2.28 and D2 = 2.30 into Z-values z1 and z2 using \displaystyle Z = \frac{D - \mu}{\sigma}. Then calculate Pr(z1 < Z < z2) in the usual way (you were shown this in your other thread http://www.mathhelpforum.com/math-he...ns-176862.html).

    If you need more help, show all your working and say where you get stuck.
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