A factory produces two types of electric lamps A and B. In an experiment relating to their life, the following results were obtained: Life (in years…
BBS Business Statistics · 2079 · Solved Question with Answer
A factory produces two types of electric lamps A and B. In an experiment relating to their life, the following results were obtained:
| Life (in years ) | Number of Motors | |
| Model A | Model B | |
| 0 - 2 | 5 | 4 |
| 2 - 4 | 11 | 30 |
| 4 - 6 | 26 | 12 |
| 6 - 8 | 10 | 8 |
| 8 - 10 | 8 | 6 |
(a) Find which model of electrical lamp has greater uniformatily of life ? Give the reason
(b) Calculate the combined standard deviation