The cholesterol levels of adult women can be described by a normal distribution

with a mean of 184 mg/dL and a standard deviation of 24.

For a group of 36 women, what is the probability that the average cholesterol

level of the group is greater than 190 mg/dL?

I can handle normal distribution problems in general. But I dont know how to deal with this one where it is asking about a group of people and getting their average cholesterol?