Algebra-1

Question Analysis
This question involves removing data points from an interval, updating its frequency, and identifying the new most frequent interval.
The main focus is on adjusting the frequency, comparing all intervals, and determining the new highest frequency.

Key Concept Explanation
Updating Frequencies and Identifying Modes: When data points are removed from an interval, its frequency decreases. The "most frequent interval" is the one with the highest frequency after the update.

Step-by-Step Solution
Update the frequency of the 21–40 emails interval: Original frequency = 18; after removing 3, new frequency = 18 - 3 = 15.
List all updated frequencies:
0–20: 9
21–40: 15