Histograms show student homework times. Group A's data is concentrated in the `45-60` minute interval. Group B's data is spread out across intervals from `30-90` minutes. Which statement about variation is true?

Both groups have equal variation.

The variation cannot be compared.

A histogram for runners in a marathon shows most runners' ages are in the `30-40` year interval. A histogram for a 5k race shows ages are spread evenly from `20-60` years. What does this suggest?

The marathon runners have a wider age variation.

The 5k runners have a wider age variation.

The age variation is the same for both races.

No conclusion can be drawn about variation.

Check the total number of data points

Ensure the interval widths are identical

Find the average of each dataset