A non-profit organization provides free mentorship services to fresh graduates aspiring for business careers. On average, requests for mentorship arrive every 2 hours. The organization currently has 4 volunteers with professional development experience and are available to provide mentorship services during business hours. It takes on average, 6 hours to review an applicant's CV and prepare a career development plan. Assume that demand is lost when there are no mentors available to provide service.

Q14. What is the probability that a new request for mentorship cannot be served (i.e., all 4 volunteers are busy)? [ Select ]

Q15. If the non-profit has a goal to serve at least 90% of the requests for mentorship, what is the minimum number of volunteers they need to hire? [ Select ]