People shopping at the grocery store are interviewed to see whether they enjoy artichokes. Only 11% of

Question:

People shopping at the grocery store are interviewed to see whether they enjoy artichokes. Only 11% of people like artichokes.
a. How many people does the interviewer expect to meet until finding the 25th person who likes artichokes?
b. What is the variance of the number of people he meets, to find this 25th person who likes artichokes?