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

Looking at the stem-and-leaf diagram, we can see that there are 5 cars that have a speed between 20-24 mph (stem of 2), 2 cars that have a speed between 25-29 mph (stem of 2), 4 cars that have a speed between 30-34 mph (stem of 3), and 3 cars that have a speed between 35-39 mph (stem of 3). Therefore, there are a total of 7 cars traveling faster than 25 mph (stems of 3 and 4) and 3 of them are traveling above 39 mph (leaf of 0). So, the number of cars that were traveling faster than 25 mph but slower than 40 mph is 9 (7+2). Hence, the answer is B)9.

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