SOLUTION: Suppose that X is normally distributed with mean 90 and standard deviation 28. A. What is the probability that X is greater than 141.8? Probability = B. What value of X d

Algebra ->  Probability-and-statistics -> SOLUTION: Suppose that X is normally distributed with mean 90 and standard deviation 28. A. What is the probability that X is greater than 141.8? Probability = B. What value of X d      Log On


   



Question 1119878: Suppose that X is normally distributed with mean 90 and standard deviation 28.
A. What is the probability that X is greater than 141.8?
Probability =
B. What value of X does only the top 13% exceed?
X =

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z value is (x-mean)/sd
z=(141.8-90)/28
z>=1.85
probability is 0.0322
top 13% is z=1.126 from the table
1.13=(x-mean)/28
x-mean=31.53
x=121.53 or 121.5