Step-by-step explanation:
= -4 ÷ ( 1/3 × (7 - 1/2) ) + 3
= -4 ÷ ( 1/3 × 13/2 ) + 3
= -4 ÷ 13/6 + 3
= -4 × 6/13 + 3
= -24/13 + 3
= -24/13 + 39/13
= 15/13
Answer: -500
Step-by-step explanation:
-408 - 92 = -500
19: He multiplied instead of dividing which will make a totally incorrect answer
Why not look up "standard deviation" yourself, to be sure? But yes, the std. dev. is the sqrt of the variance.
