Answer
a. $0.08$
b. $0.01$
c. $0.35$
d. $0.36$
Work Step by Step
The total frequency is 100.
a. Between 31 and 40, $p=8/100=0.08$
b. Under 31, $p=1/100=0.01$
c. Over 30 and under 51, $p=(8+27)/100=0.35$
d. Under 31 or over 60, $p=(1+24+11)/100=0.36$