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Question:

Three coins are tossed simultaneously 200 times with the following frequencies of different outcomes:

Outcome Frequency
3 heads 23
2 heads 72
1 head 77
No head 28
If the three coins are simultaneously tossed again, compute the probability of 2 heads coming up.

Solution:

Let A = event that 2 heads come up while tossing 3 coins simultaneously.
Number of times 2 heads come up = 72 (given)
Total number of times the coins were tossed = 200 (given)
Probability = Number of times 2 heads come up / Total number of times the coins were tossed
Probability = 72 / 200 = 9/25