Question

three coins are tossed simultaneously with the following frequency of different outcomes no head-10 one head-23 two head-42 three head-25
compute the probability
1. exactly 2 heads
2. at least 2 heads
3. all heads

Answer 1

probability of 2 heads =42/100
probability of atleast 2 head = 67/100
probability of all heads = 25/100 = 1/4