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    Probability of long distance calls

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    The long distance calls made by the employees of a company are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.2 minutes. find the probability that a call

    a. lasts between 5 and 10 minutes
    b. lasts more than 7 minutes
    c. lasts less than 4 minutes

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    Solution Preview

    Mean = 6.3 Minutes
    Std Dev = 2.2 mins

    Z = (X - mean)/ standard deviation

    once you have a z value, you can look up the ...

    Solution Summary

    The probability of long distance calls are provided.