Class lower limits 
Midclass 
Class upper limits 
Freq f 
RF 
Low 
Mid 
High 

13 
15.5 
18 
4 
0.02 
0.26 
0.31 
0.36 

18 
19.5 
21 
22 
0.11 
1.98 
2.15 
2.31 

22 
23.5 
25 
37 
0.19 
4.07 
4.35 
4.63 

26 
27 
28 
30 
0.15 
3.9 
4.05 
4.2 

29 
32 
35 
40 
0.2 
5.8 
6.4 
7 

36 
40.5 
45 
27 
0.14 
4.86 
5.47 
6.08 

46 
55.5 
65 
40 
0.2 
9.2 
11.1 
13 




200 
1 
30.07 
33.82 
37.57 


+1 Chose coherent bins 








+1 Correct frequencies ( 4, 22, 37, 30, 40, 27, 40) 








+1 Correct sample size (200) 








+1 Correct relative frequencies 








+1 Correct relative frequency sum (1.00) 








+2 Mean age between 30 and 38 








7 points 

















+1 Mean age quoted as a range (between 30 and 38) 







