Question 1175051
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Hi 
 
Normal Distribution:    μ = 124  and   σ = 20  
Continuous curve..
a) P(x > 140) = 1- P(x ≤ 140) =  1-0.7881 = .2119

b)P(x > 120) = 1-P(x ≤ 120) = 1 - .4207 = .5793

c) z =blue (x̄ - mu)/sigma/sqrt(n) = (120-124)/20/√35 =  -1.1832 
 invNorm(-1.832) = .1184
 P(z >-1.1834) = 1 - .1184 = .9916

Wish You the Best in your Studies.
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