Originally Posted by **supcom**

Grouping the first two terms together before multiplying by 145 is an error. the 145 term should be multiplied by 0.6309 only.

So......((-55.0969 + (0.6309 x 145) + (0.1988 x 86.18255) + (0.2017 x 45)) / 4.184

is the correct equation?