Can you help me with this question?

The table above shows approximate conversions from gallons to liters. what is the value of x?

Negative 5 1/12 + negative 4 1/4 + 6 3/4

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x