16.what is the modal class?
a.0-9
b.10-19
c.20-29
d.40-49

17.what is the value of the median class?
a.10-19
b.20-29
c.30-39
d.40-49

18.what is the fx?
a.85 b.112 c.3304 d.9520

19.what is the mean of the data?
a.24.5 b.29.50 c.34.5 d.40​