The mean age of 6 women in an office is 31 years old. The mean age of 4 men in an office is 29 years old. What is the mean age (nearest year) of all the people in the office?
The mean is calculated by taking the sum of the values and dividing by the count.
For instance, for the 6 women, with the mean being 31, we can see that the ages summed to 186:
And we can do the same for the men:
And now we can combine the sum and count of the men and women to find the mean for the office: