The weight of a bag of corn chips is normally distributed with a mean of 22

Question

ounces and a standard deviation of 0.5 ounces.
-The probability that a bag of corn chips weighs more than 21 ounces is?
-The probability that a bag of corn chips weighs between 20.75 and 23.25
ounces is?

Answer 1

z = (21-22)/.5

z = -2
1-.0062 = .9938

z = (20.75-22//.5
z = -2.5

z =( 23.25-22)/.5
z = 2.5
.9938-.0228 = .9710

Answer 2

Statistics - Kuai, Sunday, October 27, 2013 at 8:55pm
z = (21-22)/.5

z = -2
1-.0228 = .9710

z = (20.75-22//.5
z = -2.5

z =( 23.25-22)/.5
z = 2.5
.9938-.0062= .9876