A survey was carried out in a class to find out the allowance the students received each day from their parents. The figure below represents the allowance in pesos each student received.

15 10 30 25 30 40 20 50 20
20 30 40 20 10 10 20 10 15
40 20 20 25 10 15 30 30 20
15 10 20 10 15 20 20 50 20
10 30 30 15

a) Construct a frequency table for the data.
b) What is the least amount of allowance received by the student?
c) What is the largest amount of allowance received by the student?
d) How many students received 30 pesos a day?
e) What is the frequency of 10 pesos?