The labels on boxes of Cheesy Poofs say that the box contains 16 ounces of Cheesy Poofs, but that doesn’t guarantee that each box contains exactly 16.00 ounces. The machine that fills the boxes...

The labels on boxes of Cheesy Poofs say that the box contains 16 ounces of Cheesy Poofs, but that doesn’t
guarantee that each box contains exactly 16.00 ounces. The machine that fills the boxes doesn’t always
put out the exact same amount. The amount in each box is Normally distributed, and has a standard
deviation is .40 ounces. To help assure that most boxes contain as much or more than the label says, the
machine is set so that the mean will be 16.28 ounces. What proportion of the boxes contain…

d) …between 16.50 and 16.90 ounces?

e) …between 16.50 and 19.00 ounces?

f) …between 15.80 and 16.00 ounces?