Cumulative distribution functions
Probability theory · Mathematics
Study notes
Q: X: P(1)=0.3, P(2)=0.5, P(3)=0.2. Find F(2) and P(1 < X <= 3). F(2) = P(X <= 2) = 0.3 + 0.5 = 0.8. P(1 < X <= 3) = F(3) - F(1) = 1 - 0.3 = 0.7. (Check: P(2) + P(3) = 0.5 + 0.2 = 0.7!)