Probabilidade Exercicios Resolvidos May 2026

About 9.02%. Despite high accuracy, low prevalence means most positives are false positives. Exercise 5: Binomial Probability Problem: A fair coin is tossed 5 times. What is the probability of getting exactly 3 heads? Solution: Binomial with ( n=5, k=3, p=0.5 ): [ P(X=3) = \binom53 (0.5)^3 (0.5)^2 = 10 \times (0.5)^5 ] [ = 10 \times \frac132 = \frac1032 = \frac516 = 0.3125 ]

( \frac516 ). Exercise 6: Complement and "At Least One" Problem: If you roll a fair die 3 times, what is the probability of getting at least one 6? Solution: Easier to use complement: [ P(\textat least one 6) = 1 - P(\textno 6) ] Probability of no 6 in one roll = ( \frac56 ). [ P(\textno 6 in 3 rolls) = \left(\frac56\right)^3 = \frac125216 ] [ P(\textat least one 6) = 1 - \frac125216 = \frac91216 \approx 0.4213 ] probabilidade exercicios resolvidos

Red suits = hearts + diamonds → 2 suits × 3 face cards = 6 [ P = \frac652 = \frac326 \approx 0.1154 ] About 9

3 face cards per suit × 4 suits = 12 face cards [ P = \frac1252 = \frac313 \approx 0.2308 ] What is the probability of getting exactly 3 heads

After removing 1 red, left: 3 red + 6 blue = 9 marbles. [ P(B_2 | R_1) = \frac69 = \frac23 ]