Posted by Lauren on Wednesday, November 18, 2009 at 11:20pm.
Can someone just tell me the formula to use for this problem?
Jack is taking a four item true/false test. He decides to flip a coin to answer. What is the probablility he gets a perfect score? What is the probablility on a 10 question test?

college math  PsyDAG, Wednesday, November 18, 2009 at 11:37pm
The probability of getting any one truefalse item correct by chance = 1/2 = .5. To get the probability of all events occurring, you need to multiply the probability of the individual events.
four items = .5^4
10 items = .5^10