Quality control process show that the amount of the soft drink filled into can follow a normal distribution with mean of 330 ml and a standard deviation of 1.75 ml.

a) Find the probability that a customer would purchase a can that contains more than 331.4 ml.

The answer is 0.2119 (right??)

b)If a customer randomly selects a pack of 12 cans as one sample, what is the probability that the AVERAGE AMOUNT of soft drink of the 12 cans will be more that 331.4 ml ???

What is the answer in part B?? I feel confused.....