Suppose A's income is 100 in the year 1, and his income is expected to be anywhere between 110 and 120 in the year 2. What would be a reasonable estimate of A's (expected) income variance from year 1 to year 2? (Hey, not a homework question.)
Don't you mean ... income variance OF year 1 AND year 2? not BETWEEN year 1 and year 2 ...
I am assuming that between year 1 and year 2 ... is the dividing point of which there is no income ...
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