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Math Help - Probability Help

  1. #1
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    Smile Probability Help

    If the hourly sales at a certain register in a supermarket are normally distributed with a mean of $650 and a standard deviation of $60, find the probability that the sales during a randomly selected hour are greater than $800.
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  2. #2
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    Re: Probability Help

    Quote Originally Posted by khalyar View Post
    If the hourly sales at a certain register in a supermarket are normally distributed with a mean of \$650 and a standard deviation of \$60, find the probability that the sales during a randomly selected hour are greater than \$800.
    Find your z-score and look it up in the table.

    z-score = $\dfrac{800-650}{60}$

    Note you want the probability that sales are greater than \$800 so you take

    1 - Pr[sales < \$800] = 1 - (probability corresponding to the above z-score)
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