The following stem-and-leaf diagram shows the speeds in miles per hour (mph) of 14 cars approaching a toll booth on a bridge in Oakland, California. How many of the cars were traveling faster than 25 mph but slower than 40 mph?
A) 8
B) 9
C) 10
D) 12

Question

The following stem-and-leaf diagram shows the speeds in miles per hour (mph) of 14 cars approaching a toll booth on a bridge in Oakland, California.  How many of the cars were traveling faster than 25 mph but slower than 40 mph?
A) 8 
B) 9 
C) 10 
D) 12

Quizplus · Accepted Answer

To find the number of cars that were traveling faster than 25 mph but slower than 40 mph, we need to look at the leaves between 2 and 3 (representing the ones digit of the speed) for the stems 2, 3, and 4 (representing the tens digit of the speed). 
There are 3 leaves of 2, representing speeds of 22, 23, and 24 mph. 
There are 5 leaves of 3, representing speeds of 31, 32, 33, 34, and 35 mph. 
There is 1 leaf of 4, representing a speed of 40 mph. 
Adding the number of cars represented by each leaf, we get: 3 + 5 + 1 = 9. 
Therefore, there were 9 cars traveling faster than 25 mph but slower than 40 mph.

The Following Stem-And-Leaf Diagram Shows the Speeds in Miles Per