The following data represent the number of earthquakes worldwide in 2010 with magnitudes less than 9.0 (as of October 15, 2010).
Magnitude .... Number
0–0.9 ....... 22
1.0–1.9 ....... 22
2.0–2.9 ....... 3201
3.0–3.9 ....... 3332
4.0–4.9 ....... 7276
5.0–5.9 ....... 1430
6.0–6.9 ....... 130
7.0–7.9 ....... 18
8.0–8.9 ....... 1
Find
(a) The number of classes,
(b) The class limits, and
(c) The class width.