Solution
As a,b ,c ,d , e are consecutive odd numbers than
b = a+2
c=a + 4
d= a+6
e= a + 8
and we know that , average = $$\frac{Sumof Elements}{Number of Elements}$$
= $$\frac{a+a+2+a+4+a+6+a+8}{5}$$
= a+4
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