Algebra-1

Question Analysis
This question involves using a histogram (via its frequency table) to find the total number of students who sent more than 49 text messages.
The main focus is on identifying intervals that fit the condition ("more than 49") and summing their frequencies.

Key Concept Explanation
Frequencies of Intervals Above a Threshold: For conditions like "more than 49," we include all intervals where the lower bound is greater than 49. This ensures we count only data points that exceed the threshold.

Step-by-Step Solution
Identify intervals with more than 49 text messages:
The interval 50–74 has a lower bound of 50 (which is >49).
The interval 75–99 also has a...