Mathematics
The following data gives the information on the observed lifetimes (in hours) of 225 electrical components :
| Lifetime (in hours) | Frequency |
|---|---|
| 0 - 20 | 10 |
| 20 - 40 | 35 |
| 40 - 60 | 52 |
| 60 - 80 | 61 |
| 80 - 100 | 38 |
| 100 - 120 | 29 |
Determine the modal lifetimes of the components.
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