Home Assignment 3
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All work must be done with MS Excel
Writing
Complete “Normal Practice” problem. – Refer to the lecture recording.
If the average wait time is 12 minutes with a standard deviation of 3 minutes, determine the percentage of patrons who wait less than 15 minutes for their main course to be brought to their tables.
If the mean value of the weight of a particular brand of dog food is 20.6 lb and the standard deviation is 1.3, assume a normal distribution and calculate the amount of product produced that falls below the lower specification value of 19.7 lb.
An electrical firm manufactures light bulbs that have a lifetime is normally distributed with a mean/average (of 800 hours and a standard deviation/sigma (of 40 hours. Assume the quality inspector took ONE bulb from the final product.
What is the probability that the life time of this bulb is less than 785 hours?
What is the probability that the life time of this bulb is greater than 815 hours?
What is the probability that the life time of this bulb is between 785 hours and 815 hours?
X follows a normal distribution with a mean ( and a standard deviation (.
Find p[(-X< (+
Find p[(-X< (+
Find p[(- 3X< (+
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