ANSWER
B. 56
EXPLANATION
The average temperature is the sum of all the temperatures of the week divided by the number of days the temperature was taken:
[tex]65=\frac{76+70+x+68+55}{5}[/tex]
Solving for x:
[tex]\begin{gathered} 65\cdot5=269+x \\ 325-269=x \\ x=56 \end{gathered}[/tex]
The temperature on Wednesday was 56 ºF
