Algebra-1

Question Analysis
This question involves calculating the total number of students in a histogram whose number of siblings is 3 or fewer.
The main focus is on identifying intervals that fit the condition ("3 or fewer") and summing their frequencies.

Key Concept Explanation
Summing Frequencies for a Maximum Threshold: For a condition like "3 or fewer," include all intervals where the upper bound is ≤ 3. This ensures all data points in these intervals meet the threshold.

Step-by-Step Solution
Identify intervals with 3 or fewer siblings:
0–1 siblings: Upper bound (1) ≤ 3 → qualifies.
2–3 siblings: Upper bound (3) ≤ 3 → qualifies.
4–5 and 6–7 intervals ...