Question

lesson 13: charts and graphs
pictographs
why are pictographs most helpful for a rough estimate of amounts instead of exact numerical data?
a. symbols do not convert directly to numerical values.
b. pictographs are more accurate than circle graphs.
c. pictographs use only whole symbols.
d. pictographs use symbols and/or partial symbols.

Explanation:

To determine why pictographs are good for rough estimates (not exact data), we analyze each option:

• Option a: If symbols don't convert directly to numerical values, they wouldn't help with estimates. Eliminate.
• Option b: Pictographs aren't more accurate than circle graphs (circle graphs show proportions precisely). Eliminate.
• Option c: Pictographs can use partial symbols (e.g., half a symbol to represent a fraction of the value), so "only whole symbols" is false. Eliminate.
• Option d: Pictographs use symbols (and partial symbols) to represent quantities. Since partial symbols are approximate, they work for rough estimates (not exact numerical data). This matches the purpose of pictographs for rough estimates.

Answer:

d. Pictographs use symbols and/or partial symbols.