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Math Help - Probability Help

  1. #1
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    Exclamation Probability Help

    The reading speed of a sixth grade student is normally distributed with a mean speed of 125 words per minute and a standard deviation of 24 words per minute.
    a) what is the probability that a randomly selected sixth grade student reads less than 100 words per minute?
    b) what is the probability that a randomly selected student reads more than 140 words per minute?
    c) between 100 and 140 words per minute?
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  2. #2
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    Re: Probability Help

    Convert to the standard normal distribution then read the values off your tables.
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  3. #3
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    Re: Probability Help

    Thank you, but I don't know what the standard normal distribution formula is
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