probability that weight is between 2.18 and 2.22 oz

[statgo]

Sorry I can't figure this out:

Assume that the actual weight of a certain candy bar, whose advertised weight is 2.13 ounces, varies according to a normal distribution, with mean mu = 2.20 ounces and standard deviation sigma = 0.04 ounces. What is the probability that an individual candy bar will weigh between 2.18 and 2.22 ounces?

 

[galactus]

Use your normal distribution.

\(\displaystyle \L\\z=\frac{x-{\mu}}{\sigma}\)


Find your z-scores using the respective means given, look them up in the table and subtract.