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The median as an average this is found by putting all the numbers in numerical order from lowest to highest the number in the middle of the list is the median. For example in the list 3,5,6,9,10,11,12 the number 9 is the median.
Deviations are calculated from some value: the mean, the median, the maximum or whatever. You subtract that value from each observed value.
The first step is to find out what the deviation is from: the mean, median, some other fixed value. Whatever it is, call it m.For each observation x, calculate the absolute deviation, which is x - m or m - x, whichever is positive or zero. Finally, calculate the mean value (arithmetic average) of this set.
It depends on what other information you have. Knowing the lengths of two sides of a triangle is not enough to calculate the third. You need to have some further information: and angle, the area, the length of an altitude or a median.
The people least likely to have good incomes are those who were born into poverty. With the intentionally built barriers out of poverty, it is nearly impossible to move out of it in some situations.