Answer: 6
Explanation:
Given table: Number of pages in book Time needed to read book (hours) 
 200 18 
 175 15 
 275 21
 225 18 
 400 30 
 350 26
The number of observations in the above table = 6
When we create a scatter-plot from the table of values the number of points should be plotted =6.
Hence, the number of points should be plotted when creating a scatter-plot from the given table of values =6