Algebra-1

Question Analysis
This question involves calculating the width of intervals in a histogram.
The main focus is on understanding that interval width is the difference between the upper and lower bounds of an interval.

Key Concept Explanation
Interval Width: The total range covered by all intervals is (last lower bound - first lower bound). All intervals in a histogram have equal width to ensure fair comparison of frequencies.

Step-by-Step Solution
For 60–69 and 70–79, the next lower bound is 70, so width = 70 - 60 = 10.
Verify with another interval: 79 to 80 is 10, confirming width = 10.