Please Help with these few math questions?

Assuming that the heights of college women are normally distributed with mean 63 inches and standard deviation 3.5 inches, what percentage of women are taller than 56 inches?


Answer a. 50.0%


b. 2.3%


c. 84.1%


d. 97.7%


e. 99.9%


.


1 points


Question 16





Let x = red blood cell (RBC) count in millions per cubic millimeter of whole blood. Suppose for healthy females, x has an approximately normal distribution with mean = 4.3 and standard deviation = 0.3. Convert the following x interval from a laboratory test to a z interval.





5.5 %26lt; x





(no multiple choice, just need the answer)


.


1 points


Question 17





What does a standard score measure?


Answer a. the number of standard deviations from the mean


b. the mean plus the variance.


c. the mean plus variance.


d. the number of standard deviations from the variance.


e. the square root of the mean plus the variance.


.


1 points


Question 18





Let z be a random variable with a standard normal distribution. Find the indicated probability below.





P(-1.9 z 2.1)





Answer a. 0.982


b. 0.029


c. 0.953


d. 0.579


e. 0.471


.


1 points


Question 19





Find the area under the standard normal curve over the interval specified below.





To the left of z = 0





Answer a. 0.841


b. 0.023


c. 0.001


d. 0.159


e. 0.500


.


1 points


Question 20





Let x = red blood cell (RBC) count in millions per cubic millimeter of whole blood. Suppose that for healthy females, x has an approximately normal distribution with mean = 4.1 and standard deviation = 0.7. Convert the following z interval to an x interval.





z %26lt; 2.9





(No multiple choice just need the answer)