A farm-implement manufacturer in the Midwest purchases castings from the Omaha Steel foundry. Thirty castings were selected at random and weighed, and their masses were recorded to the nearest kilogram, as shown below:
235 | 232 | 228 | 228 | 240 | 231 |
225 | 220 | 21 8 | 230 | 222 | 229 |
21 7 | 233 | 222 | 221 | 228 | 228 |
244 | 241 | 238 | 219 | 242 | 222 |
227 | 227 | 229 | 229 | 224 | 227 |
(a) Group the measurements into a frequency distribution table having six equal classes from 215 to 244.
(b) Construct a histogram of the distribution.
(c) Determine the median, mode, and mean of the data.
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