the weight of the fish in a certain lake are normally distributed with a mean of 20 lbs and a standard deviation of 9. if 9 fish are randomly selected, what is the probability that the mean weight will be between 17.6 and 23.6lb?

for this question can i enter it in my calculator with 20 as the mean standard deviation as 9 and the lower as 17.6 and upper as 23.6? or do I need to do some calculations first?