In Oreo factory the mean mass of a cookie is given as 40 g F

In Oreo factory, the mean mass of a cookie is given as 40 g. For quality control, the standard deviation is 2 g.

a) If 10000 cookies were produced, how many cookies are within 2 g of the mean??

b) Cookies are rejected if they weigh more than 44 g or less than 36 g. How many cookies would you expect to be rejected in a sample of 10000 cookies?