Solve this complex fractions: (3/4)/2

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%

If 20% of a number is 35, what is 50% of that number?

Can someone me and do the problem plz so i can understand it more better