Learn to plot points on a coordinate plane, read and interpret graphs, and study mean, median, and frequency in data.
A point on the coordinate plane is written as (x, y), where x is the horizontal distance from the origin and y is the vertical distance.
Plot the point (3, 4). Which quadrant is it in?
3 units right, 4 units up from origin — it lies in Quadrant I (both coordinates positive)
What are the coordinates of the origin?
(0, 0)
The mean is the average of a data set. The median is the middle value when data is arranged in order. Frequency tells us how often a value occurs.
Find the mean of: 4, 8, 6, 10, 12.
(4+8+6+10+12)/5 = 40/5 = 8
Find the median of: 3, 7, 9, 2, 5 (arrange first).
Arranged: 2,3,5,7,9; median is the middle value = 5
1. Plot the point (−2, 5). Which quadrant is it in?
2. Find the mean of: 10, 15, 20, 25, 30.
3. Find the median of: 6, 1, 8, 3, 9, 2, 7 (arrange first).
4. A data set has an even number of values: 4, 8, 10, 14. Find the median.
5. What quadrant does the point (−3, −6) lie in?