Here i am now let me shove it

Alife insurance salesman sells on the average 3 life insurance policies per week. use poisson's law to calculate the probability that in a given week he will sell 2 or more policies but less than 5 policies? i just require an answer.

And intervening opportunity is an example of

How many neutrons does an element have if its atomic number is 40 and its mass number is 156?