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This would depend on each individual person and how much muscle that person has built up by working out.
I would say about $12 an hour per person for normal yard work. Anythig out of the ordinary should raise this price.
There are many populations that would not likely have a normal distribution. Endangered species or unsocial animals would be such populations.
You tend to have your eyesight tested from 6 meters or 20 feet away from the chart with the letters on it. If your eyesight is 6/12 (pronounced "six over twelve"), then your eyesight is not quite normal. This is because the letters you can read from 6 meters away can be read by a normal person from 12 meters away. That is, you have to be standing twice as close. If your eyesight is 6/6 (or 20/20 in feet), you are normal. If your eyesight is 6/5, you can see from 6 feet what a normal person can only see from 5 meters away. That is, they would have to take a step towards the chart to read these letters. 20/10 would mean that you can see things clearly at 20 feet that an average person can see clearly from 10. 20/20 is the standard for good eyesight.
Generally, when we refer to the normal distribution, it is the standard, univariant normal distribution. We don't have a normal type 1, type 2, etc. However, there are closely related distributions, the truncated normal and the multivariant normal. A truncated multivariant normal would also be possible. See related links.