if a,b,c,d,e are five consecutive odd numbers, their average is?
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when there are numbers which differ by the same number like 2 in the given data, the average is found easily.
Average = sum / 5
= [2n+1 + 2n+3 + 2n +5 + 2n+7 + 2n+9 ]/5 = 2n+5 = c
======================= simple quick method:
average of a and e = the middle number c.
average of b and d = also c.
average of c = c itself.
Thus average of all numbers = c.
Average = sum / 5
= [2n+1 + 2n+3 + 2n +5 + 2n+7 + 2n+9 ]/5 = 2n+5 = c
======================= simple quick method:
average of a and e = the middle number c.
average of b and d = also c.
average of c = c itself.
Thus average of all numbers = c.
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