The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. Speed (MPH) Frequency  50 − 54 2 
55 − 59 4 
60 − 64 5 
65 − 69 10 
70 − 74 9 
75 − 79 5 
Find mode
Median
The class mark of the first class
the 5th decile class
The range
The upper class boundery of the 3rd class
The 50th percentilee