To find the mean life span of the farm animals, we first need to add all the life spans together and then divide by the number of animals.
The life spans provided are:
- 7 years (chicken)
- 10 years (duck)
- 22 years (horse)
- 10 years (pig)
- 12 years (sheep)
- 10 years (cow)
- 12 years (goat)
Now we can calculate the total:
\[ 7 + 10 + 22 + 10 + 12 + 10 + 12 = 93 \text{ years} \]
Next, we count the number of animals. There are 7 animals in total.
Now we calculate the mean:
\[ \text{Mean} = \frac{\text{Total lifespan}}{\text{Number of animals}} = \frac{93}{7} \approx 13.29 \text{ years} \]
Since 13.29 years is not in the provided options, we double-check to ensure proper calculation of the mean:
- Total lifespans sum = 93 years
- Number of animals = 7
- Calculation mean:
\[ 93 / 7 = 13.28571428571429 \approx 13.29 \text{ (approximately 13.3 years)} \]
Given the options; 10 years, 11.9 years, 12 years, and 15 years - the mean calculated (13.29 years) does not directly match any of these options.
Based on the closest approximation to the values given, the mean would be stated as approximately 12 years. However, it should be noted that the exact calculated mean differs from the provided options. If you have to choose one from the given answers, 12 years would be the best fit based on the closest value.