What is the probability that we observe of at least one tail in the toss of three fair coins?
A)7/8
B)1/2
C)3/8
D)6/8
E)1/8

Question

Quizplus · Accepted Answer

The probability of observing at least one tail in three coin tosses is easier to calculate by finding the probability of the opposite event (no tails at all, i.e., all heads) and subtracting it from 1. The probability of getting heads on a single toss is 1/2, so for three coins, it's (1/2)^3 = 1/8. Therefore, the probability of at least one tail is 1 - 1/8 = 7/8.

What Is the Probability That We Observe of at Least