The Following Table Shows the Age Distribution of a Sample

The following table shows the age distribution of a sample of 180 students at a local college.
AGE DISTRIBUTION OF
180 STUDENTS AT A LOCAL COLLEGE
Age of Students Number of Students
15 - 19 36
20 - 24 44
25 - 29 60
30 - 34 38
35 - 39 2
Total 180
a.Of the students in the sample, what percentage is younger than 20 years of age?
b.What percentage is at least 30 years of age?
c.Based on this sample, what percentage of the students at the college do you estimate to be younger than 25 years of age?