Zones of a root tip

A list gives the distance of ten cells from the tip of a root, in mm. You will name the zone of a cell, count the cells in each zone, and find a dry weight.

The idea. In this root the meristematic zone ends at $1\ \text{mm}$ and the elongation zone ends at $5\ \text{mm}$. After that, the cells are in the maturation zone.

Your tasks.

1. Finish zone. It returns "meristematic" for a distance below 1, "elongation" for a distance from 1 up to (but not including) 5, and "maturation" otherwise.
2. Set counts to a dictionary that tells how many of the ten cells are in each zone.
3. Finish dry_weight. It gives the dry weight, in g, from the fresh weight in g and the water content in per cent.