Question 512815
Studies have shown a particular television commercial is understood by 25% of first grade students and 80% of fourth grade students. If a television advertising agency randomly selects one first grader and one fourth grader, what is the probability neither child would understand the commercial, assuming the children's reactions are independent?

-------------------
1st grade don't understand: 0.75
4th grade don't understand: 0.20
----
P(both 1st and 4th don't understand): 0.75*0.20 = 15%
================
Cheers,
Stan H.
================