A museum curator is digitizing a collection of 120 historical telescopes, assigning each a unique digital ID starting from 001 to 120. If the average ID number of the first 90 telescopes is 45.3, what is the average ID number of the remaining 30 telescopes?

Sun, 03 May 2026 19:50:15 +0000

A museum curator is digitizing a collection of 120 historical telescopes, assigning each a unique digital ID from 001 to 120. If the average ID number of the first 90 telescopes is 45.3, what is the average for the final 30? This digging into numerical patterns reflects growing interest in how institutions preserve and organize cultural heritage through digital innovation. As technology transforms museum operations, unique identifiers like these IDs help track artifacts with precision—key to managing vast historical collections in accessible, searchable formats. Why such detailed cataloging matters
The shift toward digitization in US museums reflects a broader trend toward transparency, education, and digital accessibility. Each telescope now receives a distinct ID starting at 001, forming a structured system that enables precise tracking and retrieval. The average ID of 45.3 for the first 90 telescopes reveals a carefully managed sequence beginning from the start of the catalog. Understanding how averages behave in sequential numbering offers insight into data integrity and planning for large-scale digital projects. How the math reveals missing numbers
With 120 telescopes numbered from 001 to 120, the full set forms an arithmetic series: 1 + 2 + 3 + … + 120 = 7260 total units. The average of the first 90 is 45.3, so their total sum is 90 × 45.3 = 4,077. Subtracting to find the sum of the final 30 IDs reveals a total of 4,077 – 4,077 = 3,078. Their average is 3,078 ÷ 30 = 102.6. Common questions about telescope ID averages
1. **Why isn’t the average exactly 60 or 45?**
The sequence begins at 001, so the full set’s average is 60.5—not the midpoint of 601. The select subset of early-added IDs pulls the first group’s average lower.