application of normal distribution - very lost on how to start

This is a question I have ... I am lost on how to do this when there is an extra number like the 50 put in. Can someone explain how to do this?

In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050k Wh and a standard deviation of 218k Wh. If 50 different homes are randomly selected, find the probability that their mean energy consumption level for September is greater than 1075k Wh.

https://ol.baker.edu/images/spacer.gif 0.2910 0.0438 0.2090 0.4562