A violin student records the number of hours she spends practicing during each of nine consecutive weeks: 6.2

5.0

4.3

7.4

5.8

7.2

8.4

1.2

6.3

What is the mean number of hours spent practicing per week during this period?

Idon't see any graph, however the graph of the function : f(x) = x²-2x+3 is a parabola: 1) open upward (since a> 0)2) it intersects y-axis in 3 (y=3)3) its axis of symmetry is x = +1 ( -b/2a)4) it's minimum is y = -2, so its vertex is (1,-2)5) it doesn't intersect the x-axis since discriminant < 0