Answer:
0.25
Step-by-step explanation:
Average means [tex] \frac{total \: number}{number \: \: of \: \: individuals} [/tex]
According to the formula, each student in Mr. Goldwasser's class read
[tex] \frac{66}{24} = 2.75[/tex]
books on average, and each student in Mr. Welch's class read
[tex] \frac{65}{26} = 2.5[/tex]
books on average.
Therefore, the answer will be
[tex]2.75 - 2.5 = 0.25[/tex]