Pls show me how to do this

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

How do i do this activity, is appreciated

If you measured the width of a window in inches and then in feet with measurement would you have the greater number of units