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Binomial & Poisson Distributions · Question 20 of 68

Question 20

MediumOriginal question

A fair coin is tossed 4 times. What is the probability of at least 2 heads?

Options for question 20

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. Complement: 1−P(0)−P(1)=1−116−4161 - P(0) - P(1) = 1 - \frac{1}{16} - \frac{4}{16}.

  2. =1116= \frac{11}{16}.

Worth noting

38\frac{3}{8} is exactly 2 heads; 3 and 4 heads count too.

Concept
At least r successes
Typical time
90 s
Your time
—
The rule this testsBinomial probabilities
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