Question 1197777
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Hi  
Normal Distribution: µ = 15 and σ = 6  
Using TI or similarly an inexpensive calculator like an Casio fx-115 ES plus
a. P(x>8) = 1 - P(x ≤ 8) = 1 - normcdf(-9999, 8,6, 15) = 1 - .1217= .8783
b. Continuous Curve: P(x ≤ 8) = P(x < 8) = .1217***
c. Would it be unusual to find a service call to last at most 8 minutes
Yes, it is rare***
Wish You the Best in your Studies.
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