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b. p+q = (41.5) - (56+25) = 205 - 81 = 124
(2)
persamaan 1 :
(x+y+25)/3 = 27
x+y+25 = 81
x+y = 81-25
x+y = 56
substitusikan hasil persamaan 1 ke persamaan 2 :
(x+y+25+p+q)/5 = 41
x+y+25+p+q = 205
56+25+p+q = 205
p+q = 205-56-25
p+q = 124
mean dari p dan q