The variable xx denotes the time taken in seconds for a computer link to be made between the terminal in an executive's office and the computer at a remote factory site. x is known to have a Normal distribution, with a mean of 15 seconds and a standard deviation of 3 seconds.  Calculate P(x>20), i.e., the probability that it takes longer that 20 seconds for the link to be made.   (Give a proportion to 4 decimal places.)

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The variable xx denotes the time taken in seconds for a computer link to be made between the terminal in an executive's office and the computer at a remote factory site. x is known to have a Normal distribution, with a mean of 15 seconds and a standard deviation of 3 seconds.  Calculate P(x>20), i.e., the probability that it takes longer that 20 seconds for the link to be made.

 

(Give a proportion to 4 decimal places.)

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