Question

12. The average of 7.5, 3.2, 11.3, 20.5 and x is
10. Find the value of x.
(a) 73
(b) 7.5
(c) 7.8
(d) 7.9​

Answer 1

(7.5+3.2+11.3+20.5+X)/5 = 10

7.5+3.2+11.3+20.5+X = 50

X = 50-7.5-3.2-11.3-20.5 = 7.5

(b)