Need help with this math problem please

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.