Question 1133438
a. For between 19-40, I have to assume it is 20-39, for there is no way to do 40 alone, but the 40s can be completely excluded. There are 8.
b. 70 or older is 0.1333 or 4/30 or 13.3%
c. under 40 age relative frequency is 8/30 or 0.2666
d. is 0.4000 (there are 12 under 50 out of 30 altogether).