Suppose baseball batting averages were normally distributed with mean 250 and standard deviation 15. Using the approximate empirical rule about what percentage of players would have averages between 220 and 235? Suppose peoples systolic blood pressure were normally distributed with mean 130 mmHg and standard deviation 5mmHg. Using the approximate empirical rule about what percentage of heights would be below 125 mmHg? Assume the length of a part has a normal distribution with mean 10.0 an inches and standard deviation 1.0 find the proportion of parts that are between 8.5 and 10.5 inches? Assume the length of a part has a normal distribution with mean 10.0 and standard deviation find the proportion of parts that are above 8.4 inches