Round mean values calculated during data analysis

Closes #201 (closed)

dan/datasets/analyze/statistics.py

 # -*- coding: utf-8 -*-
 import logging
 from collections import Counter, defaultdict
+from functools import partial
 from pathlib import Path
 from typing import Dict, List, Optional
 
@@ -38,7 +39,7 @@ def create_table(
         [
             ("Min", np.min),
             ("Max", np.max),
-            ("Mean", np.mean),
+            ("Mean", partial(np.mean, dtype=np.float16)),
             ("Median", np.median),
         ]
     )