Four employees who work as drive-through attendees at a local fast food restaurant are being evaluated. As part of quality control improvement initiative and employee evaluation these employees were observed over three days. One of the statistics collected is the proportion of time employees forget to include a napkin in the bag. The table below is directly related to the statistics collected.
Employee % of Dinners Packed % of Forgotten Napkins
Joe 25% 6%
Jan 20% 2%
Cheryl 20% 10%
Clay 35% 4%
a. What is the probability that there is no napkin included for a given order?
b. You just purchase a dinner and found that there is no napkin in your bag, what is the probability that Jan has prepared your order?