Grade 12 · Math
Find a binomial coin-toss probability practice
Combine independent equally likely trials with a count of favorable position sets.
Opening your practice adventure…
Try a sample
A fair coin is tossed 8 times independently. What is the probability of exactly 3 heads? Give a fraction in simplest form.
See the answer & why
There are 256 equally likely ordered outcomes. Choose the 3 head positions in 56 ways: probability = 7/32.
A little hint: Count ways to choose the head positions, then divide by all equally likely toss sequences.
A teaching tip
Choose the successful positions and multiply by each sequence’s probability.