One homework problem I have asks me to find what age added to a set of 15 ages, would lead to a mean of 54.94. The total of the 15 ages given minus the missing age = 828.
I am not sure if I did this right, but I set up the following equation to locate the X variable (the missing age in the line of ages).
828+x divided by 16 = 54.94 or (828 + X)/16 = 54.94
I seem to forget how to isolate the X variable. No matter what I do, it doesn't seem to work out. Perhaps I didn't even set it up correctly.
I would appreciate any help on this.