Probability and Statistics for Engineering and the Sciences
9th Edition
ISBN: 9781305251809
Author: Jay L. Devore
Publisher: Cengage Learning
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Chapter 9, Problem 74SE
The derailment of a freight train due to the catastrophic failure of a traction motor armature bearing provided the impetus for a study reported in the article “Locomotive Traction Motor Armature Bearing Life Study” (Lubrication Engr., Aug. 1997: 12–19). A sample of 17 high-mileage traction motors was selected, and the amount of cone penetration (mm/10) was determined both for the pinion bearing and for the commutator armature bearing, resulting in the following data:
| Motor | ||||||
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Commutator | 211 | 273 | 305 | 258 | 270 | 209 |
| Pinion | 226 | 278 | 259 | 244 | 273 | 236 |
| Motor | ||||||
| 7 | 8 | 9 | 10 | 11 | 12 | |
| Commutator | 223 | 288 | 296 | 233 | 262 | 291 |
| Pinion | 290 | 287 | 315 | 242 | 288 | 242 |
| Motor | ||||||
| 13 | 14 | 15 | 16 | 17 | ||
| Commutator | 278 | 275 | 210 | 272 | 264 | |
| Pinion | 278 | 208 | 281 | 274 | 268 | |
Calculate an estimate of the population
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Chapter 9 Solutions
Probability and Statistics for Engineering and the Sciences
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