2 answers:
It's just simple subtraction. The answer is -21.
*Tip: I method I like to use is, when both numbers are negative, just add them and add the negative sign.
Hope I helped! <3
The answer is -21. Rule is that you follow the sign of the larger and add the opposite
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Think it's B or A if they want it simplified.
Standard deviation=4.
let the mean be 12 and the score be 0 (therefore 12 point difference.)
0-12/s=-3 (s being standard deviation)
-12/4 = -3
Yes they are equivalent to each other
