Question 1061748
P(x)=e(-lambda)*lambda^x/x!  Poisson distribution--discrete, proportional, could be infinite theoretically
lambda=16 or 4 per quarter hour
P(2)=0.1465.  That is e^(-4)(4^2)/2!
P(4)=0.1954
P(6), now lambda is 8; 0.1221
7 more  (if that is the intent of the question)  is a lambda of 12. If it is more than 7, it is longer to do but it's done the same way using the formula above.  From the table, more than 7=0.9105.
e^(-12)*12^7/7!
=0.0437