Math Is Fun Forum

Guess 1: 528

445:

To get the mean (which is the average, right?), just multiply the number of occupants with the number of cars, add them all up, and divide the number from the total number of cars:

Total
Occupants             Cars
2 x 25 = 50             25
3 x 20 = 60             20
4 x  3  = 12              3
5 x  2  = 10              2
          =132         =50

132 / 50 = 2.64

So the mean is 2.64

I guess you just have to place that number into the equation, replacing x:

and simplifying it.

Or maybe there's something more to functions that I don't know of...

P.S. I'm just fooling around here with the LaTeX

The first two numbers are 5 and 2. The two remaining possible answers are 528 and 520

Guess#4: 528

I keep on forgetting the volume of a sphere. I squared the radius, hehe.