I'm confused about some simple binomial distribution problems in my textbook. Suppose p = 0.2 and n = 4. Calculate:
- P(x=2). The answer I got was 0.512
- P(x<=2). The answer I got was 1.536
I am using the standard binomial formula. The textbook is giving me different answers however, even though I followed the formula to the letter. The textbook answers are 0.5136 and 0.9728 respectively.