SOLUTION: A normal population has a mean of 20 and a standard deviation of 4. a. Compute the z value associated with 24. (Round your answer to 2 decimal places.) Z

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Question 1036957: A normal population has a mean of 20 and a standard deviation of 4.

a. Compute the z value associated with 24. (Round your answer to 2 decimal places.)

Z

b.
What proportion of the population is between 20 and 24? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.)


Proportion

c.
What proportion of the population is less than 15? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.)


Proportion


Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z value is (24-20)/4=+1
0.3413
This is (15-20)/4=-1.25 for z
P(z<-1.25)=0.1056