Set up a proportion.
[tex] \frac{3~minutes}{2~questions} [/tex] = [tex] \frac{x~minutes}{12~questions} [/tex]
Cross multiply.
2x=36
x=12
It would take her 12 minutes.
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Formula for surface area of a cube: 6a² where a=20.
6 x (20)²
6 x 400
= 2400
Surface area: 2400 cm
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Mean absolute deviation: The average distance from each number in the set to the mean of the set.
Mean of the set: [tex] \frac{(3+8+10+12+15)}{5} = \frac{48}{5} = 9.6[/tex]
9.6-3=6.6
9.6-8=1.6
10-9.6=0.4
12-9.6=11.4
15-9.6=5.4
Mean of 6.6, 1.6, 0.4, 11.4, and 5.4: [tex] \frac{(6.6+1.6+0.4+11.4+5.4)}{5} = \frac{25.4}{5} = 5.08[/tex]
