The table shows information about the heights, in cm, of a group of Year 9 girls. 150 cm
least height
median
greatest height
165 cm
170 cm
This stem and leaf diagram shows information about the heights, in cm, of a group
of 15 Year 9 boys.

15 8 99
16 4 5 7 7 8
17 0 3 4 4 7
18 02

Key: 15 | 8 represents 158 cm

Compare the distribution of the heights of the girls with the distribution of the heights of
the boys.

(Total for Question 7 is 3 marks)

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for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.