Final answer:
Without the histogram, it's impossible to determine the percentage of people aged 25-40 with a systolic blood pressure reading greater than or equal to 130 mm Hg. The question falls under the subject of Mathematics and requires a histogram to analyze the data.
Step-by-step explanation:
The question asks to determine what percentage of people aged 25-40 had a systolic blood pressure reading greater than or equal to 130 mm Hg. To answer this question, one would need to refer to the relative-frequency histogram provided for these ages. Since the histogram is not actually provided here, we can't compute an exact percentage.
Clinical trials indicate that people with blood pressure on the lower end of the spectrum tend to have better long-term cardiovascular health, with a systolic pressure around 115 mm Hg considered more favorable than 120 mm Hg. The typical young adult has a blood pressure of 120/80 mm Hg, which is also known as 120 over 80.
Understanding that systolic blood pressure readings greater than or equal to 130 mm Hg could be a cause for health concerns, knowing the percentage of people in this range can be important for public health studies and initiatives.