Statistics ITU Board 2081
A factory produces two types of electric lamps A and B, in an experiment relating their life, the following results were obtained: Length of life in 1000 hours 4 6 6 8 8 10 10 12 Number of lamps A 7…
5A factory produces two types of electric lamps A and B, in an experiment relating their life, the following results were obtained:
| Length of life in 1000 hours | 4-6 | 6-8 | 8-10 | 10-12 |
|---|---|---|---|---|
| Number of lamps A | 7 | 9 | 11 | 3 |
| Number of lamps B | 5 | 10 | 13 | 2 |
State (i) which model has a longer average life?
(ii) Which model is more consistent in terms of life?
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