Answer:
11/16
Explanation:
Total possibilities = 2^4= 16 since each toss leads to 2 outcomes. Way of getting no tail in 4 tosses = 1 (H H H H) Way of getting 1 tail in 4 tosses = 4 (T H H H) (H T H H) (H H T H) (H H H T) So ways of getting at least two tails in 4 tosses = 11 (16-5) Therefore, the probability = 11/16