A ‘less than’ cumulative frequency table for the weekly pocket money (in ₹) of 50 students is given below.
Pocket money below ₹10 : 4
Pocket money below ₹20 : 11
Pocket money below ₹30 : 23
Pocket money below ₹40 : 37
Pocket money below ₹50 : 45
Pocket money below ₹60 : 50
Use the information to answer the following.
a. (i) Convert the data into a simple frequency distribution with class intervals 0–10, 10–20, … , 50–60.
b. (ii) Construct a ‘more than’ cumulative frequency table for the same class intervals.
c. (iii) Determine the class interval in which the 30th percentile (i.e., the lowest 30 % of observations) falls.