The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days and a standard deviation of 17 days. What percentage of pregnancies last fewer than 314 days? P(x < 314 days) = P(z<

P(y>250) mean is 250 and standard deviation is 50

X is a normally distributed variable with mean = 67 and standard deviation = 9 %3D What value of X separates the upper 17.36% of scores from those below X?

High density lipoprotein (HDL) in healthy males follows a normal distribution with a mean of 50 and a standard deviation of 8. What proportion of healthy males has HDL exceeding 60?

Resting pulse rates for healthy adults are found to have approximately a Normal distribution with a mean of 69 beats per minute and a standard deviation of 8.5 beats per minute. Between what two values do the central 80% of all resting pulse rates lie?  what is lower value and  upper value ?

The scores for a standardized test follow a normal distribution with a mean test score x¯=84, and standard deviationσ=6. What percent of students score below 87? What percent of students score above 95? What percent of students score between 70 and 90? What percent of students score between 95 and 100? What score must a student get higher than to be in the top 10%?

A normal population has a mean  μ = 31 and standard deviation = 8. What proportion of the population is less than 29?