SOLUTION: The time it takes a randomly selected employees to perform a task is normally distributed with a mean value of 120 seconds and standard of 20 seconds Calculate the probability tha

Algebra ->  Probability-and-statistics -> SOLUTION: The time it takes a randomly selected employees to perform a task is normally distributed with a mean value of 120 seconds and standard of 20 seconds Calculate the probability tha      Log On


   

Question 1179257: The time it takes a randomly selected employees to perform a task is normally distributed with a mean value of 120 seconds and standard of 20 seconds
Calculate the probability that a randomly selected employee will complete:
(I) The task within 100 to 130 sec
(II) In more than 75sec
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Distribution: normal with µ = 120 and σ = 20
Using TI or similarly an inexpensive calculator like an Casio fx-115 ES plus
SELECT ONE:
P( 100 < x < 130) = normalcdf(100,130,120,20) = .5328

P( x > 75) = normalcdf(75,9999,120,20) = .9878 

Wish You the Best in your Studies.