SOLUTION: The amount of time that office workers at Company XYZ spend on the computer each workday is normally distributed with a mean of 3.1 hours and a standard deviation of 0.5 hours. Fi

Question 869231: The amount of time that office workers at Company XYZ spend on the computer each workday is normally distributed with a mean of 3.1 hours and a standard deviation of 0.5 hours. Find the percentage of office workers at Company XYZ who spend less than 4.1 hours on the computer per workday.
(a) 97.72% (b) 65.00% (c) 95.00% (d) 99.70%
I have:
4.1 - 3.1= 1/.5 = 2. Looked up in the back of chart E (Standard deviation) and got .9772 turned into percent would be 97.72%, correct?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
z = (x-mu)/sigma
z = (4.1-3.1)/0.5
z = 1/0.5
z = 2

Now use a table to find the area to the left of z = 2. This is approximately 0.9772 (roughly 97.72%)

So you are correct. The only typo you made was writing when you should have written

(greek letter lowercase mu)
(greek letter lowercase sigma)

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