Binomial Distribution
A discrete probability distribution for the number of successes X in n independent Bernoulli trials, each with success probability p, denoted X ~ B(n, p).
Real World
A pharmaceutical trial at Pfizer tests whether 20 patients respond to a drug with a known 70% success rate — the number of responders follows B(20, 0.7).
Exam Focus
State the distribution fully as X ~ B(n, p) before calculating; marks are awarded for this setup even if arithmetic errors follow.
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