The Riders of the New Town Elementary School Bus Consists $\frac { a } { b }$

Short Answer

The riders of the New Town Elementary school bus consists of 5 five year olds, 3 six year olds, 10 eight year olds, 1 nine year old, 4 eleven year olds and a twelve year old. A child is selected at random and her age is noted. Let X be the outcome. Find E(X). Enter just a reduced fraction of form $\frac { a } { b }$ (no label).