Answer:
a) 34 students scored below an 81%
b) Interval 81-100
c) 34.6 rounded to 35% of students scored no higher than 60%
d) 38.4% of students scored at least 81%
Explanation:
a) the frequency refers to the number of students and each of the bars shows how many students got into a certain range of scores. So you would count the frequency for 4 of the ranges except for the last one.
b) interval 81-100 contained the most scores as it has the highest frequency
c) 2+4+12= 18 students scored no higher than 60%, the total number of students is 52 students. So to get the answer you would divide
18/52= 0.346 x 100= 34.6= 35%
d) 20/52= 0.384 x 100= 38.4%