40 years as a mathematician and I have never seen them in parentheses!
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The y-axis of an ogive is always the cumulative frequencies while the x-axis is the class boundaries.
The first coordinate always is called the "x" coordinate, because it goes on the "x" axis, while the second coordinate is always called the "y" coordinate because it always goes on the "y" axis.
You know which is the x coordinate and which is the y coordinate because (x,y) is an ordered pair. The x is always first and the y second. For example, the point (4,5) has x coordinate of 4 and y of 5.
The y axis is referred to as the ordinate axis The x axis is called the abcissa
The Y. The bottom one is the X axis, the up one is the Y axis and the depth one is the Z axis (not always used)