3. A trainer is teaching a dolphin to do tricks. The probability that the dolphin successfully performs the trick is 21%, Out of 17 attempts, you want to find the probability that the dolphin succeeds: a) 3 or more times. P = 21-0-21 100 n = 17 91-p=1-0.21 = 0.79 x~B(n=17, p = 0.21) P(x≥3) b) less than 6 times. P(x) 6) c) at least 4 times. P(x74) 1-P(x3)=1-5073 = 0.4927