SOLUTION: The time taken for a computer to boot up, X, follows a normal distribution with mean 30 seconds and standard deviation 5 seconds. What is the z-score for a boot up time of x = 3

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Question 387872: The time taken for a computer to boot up, X, follows a normal distribution with mean 30 seconds and standard deviation 5 seconds.
What is the z-score for a boot up time of x = 30 seconds?
What is the z-score for a boot up time of x = 20 seconds?

Found 2 solutions by user_dude2008, robertb:
Answer by user_dude2008(1862) About Me  (Show Source):
You can put this solution on YOUR website!
x=30 --> z = (x-mu)/sigma = (30-30)/5 = 0

x=20 --> z = (x-mu)/sigma = (20-30)/5 = -10/5 = -2

Answer by robertb(5830) About Me  (Show Source):