Algebra-1

Question Analysis
This question involves calculating the total number of students in a histogram who scored 70 or higher.
The main focus is on summing the frequencies of all intervals that include scores of 70 or higher.

Key Concept Explanation
Including Intervals in a Higher Range: For scores ≥70, we include all intervals where the lower bound is 70 or higher, as these intervals contain only scores that meet the condition.

Step-by-Step Solution
Identify intervals with scores ≥70: 70–79, 80–89, 90–99.
Sum their frequencies: 10 (70–79) + 8 (80–89) + 4 (90–99...