Answer:A
Step-by-step explanation:
I did my test and this is answer maybe
Y-4=1/4*(x-1)²
<span>y=1/4(x-1)²+4
</span><span>the parabola y=1/4x2 with vertex at the point (1;4),the branches up,x=1 is the axis of symmetry intersects the axis of the OY at the point (0;4 1/4)
</span>
<span>Store A, because the ratio of the number to the cost is 1:3 in Store A and 1:4 in Store B
</span>
Answer:
2.5
Step-by-step explanation:
lower quartile.
3, 4, 5, 5, 6, 6, 7, 7, 8
median = 6
lower quartile 1/4th position
(4+5)/2 = 4.5
Upper quartile 3/4th position
(7+7)/2 = 7
Interquartile range = upper quartile - lower quartile
= 7 - 4.5
= 2.5