Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour)of 49 randomly chosen vehicles on highway I-80 in Nebraska.The modal class is:
A) 60 but less than 70.
B) 70 but less than 80.
C) 80 but less than 90.
D) impossible to determine.

Question

Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour)of 49 randomly chosen vehicles on highway I-80 in Nebraska.The modal class is: 
A) 60 but less than 70. 
B) 70 but less than 80. 
C) 80 but less than 90. 
D) impossible to determine.

Quizplus · Accepted Answer

The mode (most frequent value) of the data appears to be in the 70-79 mph range, as there are 18 values in this range compared to 14 values in the 60-69 mph range and 13 values in the 80-89 mph range. Therefore, the best choice is B, 70 but less than 80.

Below Is a Sorted Stem-And-Leaf Diagram for the Measured Speeds