In a game the player wins if you roll a six on a number cube is the number cube is rolled 18 times then what is a reasonable prediction for the number of unsuccessful rolls

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%