rt. Extensive data collection has shown that the noise level (measured from a specific point on the ground) is a variable following a normal distribution with a mean of 95 decibels, and a standard deviation of 10 decibels. The noise levels from jet to jet can be considered to be independent.
What percent of jets have noise levels between 80 and 100 decibels ?
ution with a mean of 267 days and a standard deviation of 9 days.
(a) What is the minimum pregnancy length that can be in the top 8% of pregnancy lengths?
(b) What is the maximum pregnancy length that can be in the bottom 6% of pregnancy lengths?