pls help with hw question

The weight of an organ in adult males has a bell-shaped distribution with a mean of 330 grams and a standard deviation of 50 grams. Use the empirical rule to determine the following. (a) About 95% of organs will be between what weights? (b) What percentage of organs weighs between 280 grams and 380 grams? (c) What percentage of organs weighs less than 280 grams or more than 380 grams? (d) What percentage of organs weighs between 230 grams and 480 grams? ..... (a) and grams (Use ascending order.) (b) % (Type an integer or a decimal.) (c) % (Type an integer or a decimal.) (d) % (Type an integer or decimal rounded to two decimal places as needed.)