Wai recorded the length of each wire needed for a science project. what is the total length of wire needed?

The picture in the attached figure

we know that
the attached figure is a frequency table

Multiply each number of Length by its frequency
The product is the total amount for that value  
Add the products 
so
(1/8)*1+(1/4)*1+(1/2)*3+(3/4)*8+(1)*4+1 3/8*(2)
1 3/8----> 11/8
=(1/8)*1+(1/4)*1+(1/2)*3+(3/4)*8+(1)*4+11/8*(2)
=(1/8)+(1/4)+(3/2)+(6)+(4)+11/4
=(1+2+12+48+32+22)/8
=117/8-----> 14.625-----> 14 5/8 ft

the answer is
14.625 ft or 14 5/8 ft