Please help me answer this one, thank you!

Solve Me Solve the following problems by supplying the needed information. The average number of calories in a 1.8-ounce chocolate bar is 230. Suppose that the distribution of calories is approximately normal with a standard deviation of 10. 1. Find the probability that a randomly selected chocolate bar will have less than 200 calories. 2. Find the probability that a randomly selected chocolate bar will have greater than 195 calories. 3. What is the percentage that a cholate bar is randomly selected between 200 calories and 250 calories