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24 November, 09:54

The time it takes to train a newly hired telephone sales representative is normally distributed with a mean of 136 hours and a standard deviation of 8.9 hours. what is the probability that training for a given individual will last between 130 and 140 hours?

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  1. 24 November, 10:12
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    Using z-scores for 130 and 140 hours, and a standard normal distribution table, the cumulative probabilities for 130 and 140 hours are 0.254 and 0.673 respectively.

    The required probability is 0.673 - 0.254 = 0.42 to 2 d. p.
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