The cumulative frequency function of the data below is given below by the equation y = cf(x). What is cf(5)?
(begin{array}{cc} Score(n) & Frequency(f)\hline 3 & 30\ 4 & 32\ 5 & 30\ 6 & 35\8 & 20 end{array})

A.
30 
B.
32 
C.
55 
D.
62 
E.
92
Correct Answer: Option E
Explanation
If y = cf(x)
cf(5) = 30 + 32 + 30
= 92