Algebra-1

Question Analysis
This question tests the ability to calculate the proportion of data within a specific range using a dot plot.

Key Concept Explanation
In a dot plot, the proportion of data within a specific range can be calculated by counting the number of points within that range and dividing by the total number of points.

Step-by-step Solution
1. Organize the dataset in ascending order: {60, 65, 65, 70, 70, 70, 75, 75, 75, 80, 80, 80, 85, 85, 90}.
2. Draw a dot plot and mark the points for each value.
3. Count the number of points with scores 75 or higher: 75 (3), 80 (3), 85 (2), 90 (1) = 9 points.
4. Count the total number of points: 15 points.
5. Calculate the proportion: Proportion =

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