posted by kinshassa on .
The height of 18-year-old men are approximately normally distributed, with mean of 68 inches and a standard deviation of 3 inches. What is the probability that an 18-year-old man selected at random is between 67 and 69 inches tall? Round your answer to the nearest thousandths place (3 places).
Use z-scores and a z-table to find your probability.
z = (x - mean)/sd
mean = 68
sd = 3
Find two z-values, using 67 and 69 for x.
Next, check a z-table for the probability between the two z-scores.
I hope this will help get you started.