please help me on math

2. An article suggests a normal distribution with mean 135.3 oz and standard deviation 2.8 oz for the actual contents of jars of a certain type. The stated contents was 133 oz. a. What is the probability that a single jar contains more than the stated contents? b. Among ten randomly selected jars, what is the probability that the mean contents will be more than the stated contents? c. If fifteen randomly selected jars are considered, what percent of mean content amounts will be more than 131.5 oz