The probability of at least one head in two flips of a coin is
A) 0.25.
B) 0.33.
C) 0.50.
D) 0.75.

Question

The probability of at least one head in two flips of a coin is​
A) ​0.25.
B) ​0.33.
C) ​0.50.
D) ​0.75.

Quizplus · Accepted Answer

The probability of getting at least one head in two flips is 1 minus the probability of getting no heads (which is getting tails both times). The probability of getting tails on each flip is 0.5, so the probability of getting tails twice is 0.5 * 0.5 = 0.25. Therefore, the probability of getting at least one head is 1 - 0.25 = 0.75.

The Probability of at Least One Head in Two Flips