Why would a welder stick the end of the filler rod in the weld pool as the weld is being stopped?

Which one of the following is not a good procedure to follow if you wish to avoid being rear ended by another vehicle

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.

Which allows college students to work part time jobs to pay for educational expenses ?