Questions 11 to 14 refer to this dot plot that shows the number of concerts attended by a sample of teenagers in the previous year.
11. what is the 8th decile
a) 4
b) 4.5
c)5
d) 5.5
12. which value cuts off the lower 20% of scores?
a) 2
b) 1
c) 3
d) 1.5
13. which value cuts off top 40% of scores?
a) 3
b) 2
c) 2.5
d) 3.5
14 what is the percentage of students that went to more than one concert?
a) 90%
b) 80%
c) 65%
d) 70%
Explain with working out