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 time represents the 20th percentile of the times to train a newly hired telephone sales representative?
Z score for 20th percentile = Z_{20} = -0.84
Z = (X - mean) / sd
or, X = mean + Z * sd
or, X = 136 - 0.84 * 8.9
or, X = 128.5 hours
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