Answer:
More than 3.3 inches.
Step-by-step explanation:
The average precipitation for October, November, and December is determined by adding the total precipitation for all three months and dividing it by three. If the average precipitation exceeds 3.11, the following relationship must be true:
[tex]\frac{O+N+D}{3}>3.11\\\frac{2.98+3.05+D}{3}>3.11\\D>9.33 -6.03\\D>3.3\ in[/tex]
More than 3.3 inches must fall in December so that the average monthly precipitation for these months exceeds 3.11 in.
