Hi! I've been trying to figure out which formula is used for the mean because it is more than a basic average. Using the information below, how would I find the 15 in the denominator? There are 30 teams total.

Refer to the Baseball 2012 data. Compute the mean number of home runs per game. To do this, first find the mean number of home runs per team for 2012. Next, divide this value by 162 (a season comprises 162 games). Then multiply by 2 because there are two teams in each game. Use the Poisson distribution to estimate the number of home runs that will be hit in a game. Find the probability that:

The Mean = 4934/ [(15)(162)] = 2.0305