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Question
In a research laboratory scientists treated 6 mice with lung cancer using natural medicine. Ten days later, they measured the volume of the tumor in each mouse and given the results in the table
| Mouse marking | 1 | 2 | 3 | 4 | 5 | 6 |
| Tumor Volume (mm3) | 145 | 148 | 142 | 141 | 139 | 140 |
Find the mean
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Solution
| Mouse marking (f) |
Tumor Volume (mm3) (x) |
fx |
| 1 | 145 | 145 |
| 2 | 148 | 296 |
| 3 | 142 | 426 |
| 4 | 141 | 564 |
| 5 | 139 | 695 |
| 6 | 140 | 840 |
| `sumf` = 21 | `sumfx` = 2966 |
`bar(x) = (sumfx)/(sumf)`
= `2966/21`
= 141.238
= 141.24
The Arithmetic mean = 141.24 mm3
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