Means-to-MAD ratio is something that wouldn't be hard to find out, but I've certainly
never even heard of it.
The
mean (
µ) of a set of data points is found by adding them up and dividing by the number of data points.
For our first set:

For our second set:

The mean absolute deviation is when you find the distance of each data point from the mean and then find the mean of those distances.
For our first set:

For our second set:

It wouldn't be hard to find the ratio between these for each set as the question asks...don't forget to put our ratio in simplest form!
For the first set:

For the second set:

(In a fraction, we would just put this as 3 because the ÷1 is redundant...however, because this is ratio, we have to keep it in)