Solve the Problem $\frac { 1 } { 10 }$ B) $\frac { 1 } { 4 }$

Solve the problem.
-An employment agency required 20 secretarial candidates to type the same manuscript. The Number of errors found in each manuscript is summarized in the histogram. Find the empirical Probability that a candidate has less than four errors in the typed manuscript.

A) $\frac { 1 } { 10 }$
B) $\frac { 1 } { 4 }$
C) $\frac { 2 } { 5 }$
D) $\frac { 1 } { 2 }$