Have you ever tried to get out of jury duty? About 25% of those called will ­find an excuse (work, poor health, travel out of town, etc.) to avoid jury duty.

(a) If 12 people are called for jury duty, what is the probability that all 12 will be available to serve on the jury?

(b) If 12 people are called for jury duty, what is the probability that 6 or more will not be available to serve on the jury?

(c) Find the expected number of those available to serve on the jury. What is the standard deviation?

(d) Quota Problem How many people n must the jury commissioner contact to be 95.9% sure of fi­nding at least 12 people who are available to serve?