Numbers

Adding up some numbers and getting an average to 4 decimal places

Operations

The order of operations:
brackets
exponent
division & multiplication
addition & subtraction

where the operators have equal priority then the order is taken from left to right

combination of operations
Plus (Plus) = Plus
Minus (Minus) = Plus
Plus (Minus) = Minus
Minus (Plus) = Minus

Plus x Plus = Plus
Minus x Minus = Plus
Plus x Minus = Minus
Minus x Plus = Minus

Plus / Plus = Plus
Minus / Minus = Plus
Plus / Minus = Minus
Minus / Plus = Minus

spurious accuracy ??