Example The average length of a maternity stay in a U.S. hospital is said to be 2.4 days with a standard deviation of 0.9 days. We randomly survey 55 women who recently bore children in a U.S. hospital.  What is the probability that their average stay is no more than 2.5 days. n = [n] =  = [m]  = = [s]   Round to 4 decimal places.

The life of Sunshine CD players is normally distributed with a mean of 4.1 years and a standard deviation of 1.3 years.  We are interested in the length of time a CD player lasts. Find the probability that a Sunshine CD player will last longer than [y] years.  Round to 4 decimal places.

Link to Examples Using StatCrunch Link to Examples Using TI 83/84 Calculator X∼N(295, 43).   Find the probability that x

Example The average length of a maternity stay in a U.S. hospital is said to be 2.4 days with a standard deviation of 0.9 days. We randomly survey 60 women who recently bore children in a U.S. hospital.  What is the probability that their average stay is at least 2.5 days n = [n] =  = [m]  = = [s]   Round to 4 decimal places.

Link to Examples Using StatCrunch Link to Examples Using TI 83/84 Calculator X∼N(56.8, 2.1).   Find the probability that 60

Example The average length of a maternity stay in a U.S. hospital is said to be 2.4 days with a standard deviation of 0.9 days. We randomly survey 35 women who recently bore children in a U.S. hospital.  What is the probability that their average stay is between 1 and 2 days, inclusive. n = [n] =  = [m]  = = [s]   Round to 4 decimal places.

Link to Examples Using StatCrunch Link to Examples Using TI 83/84 Calculator X∼N(56.8, 2.1).   Find the probability that 60

Heights of adult women are approximately normally distributed with a mean of 64.5 inches and a standard deviation of 2.5 inches. Find the probability that a randomly select adult woman has a height between 62 and 66 inches.   Round to 4 decimal places. [p] Find the 25th percentile.  (Find the height with an area of 0.25 to its left.)  Round to 1 decimal place. [t]

Heights of adult women are approximately normally distributed with a mean of 64.5 inches and a standard deviation of 2.5 inches. Find the probability that a randomly select adult woman has a height between 65 and 71 inches.   Round to 4 decimal places. [p] Find the 85th percentile.  (Find the height with an area of 0.85 to its left.)  Round to 1 decimal place. [t]

Example The average length of a maternity stay in a U.S. hospital is said to be 2.4 days with a standard deviation of 0.9 days. We randomly survey 60 women who recently bore children in a U.S. hospital.  What is the probability that their average stay is at least 2.5 days n = [n] =  = [m]  = = [s]   Round to 4 decimal places.