SOLUTION: Statistics question 15: A normal distribution has a Mew μ =80 and standard deviation σ = 20. Find the following proportions: p(X>85) p(X>70) p(X>92) p(X>64

Algebra ->  Probability-and-statistics -> SOLUTION: Statistics question 15: A normal distribution has a Mew μ =80 and standard deviation σ = 20. Find the following proportions: p(X>85) p(X>70) p(X>92) p(X>64      Log On


   

Question 1095850: Statistics question 15:
A normal distribution has a Mew μ =80 and standard deviation σ = 20.
Find the following proportions:
p(X>85)
p(X>70)
p(X>92)
p(X>64)15
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x-mean)/sd
>(85-80)/20 which is z>.25
This is 0.4013
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>(70-80)/20 which is z>-0.5
This is 0.6915
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>(92-80)/20 which is z>+0.6
This is 0.2743
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>(64-80)/20 which is z>-0.8
This is 0.7881