This is a binomial distribution. Use BINS to determine if this is binomial. B - binary? I - independent? N - number of trials S - probability of success
B - yes, 3 or not a 3 I - yes, past rolls do not impact future rolls N - 20 trials S - prob success 1/6
Use binompdf on your calculator to find out the probability. To access, 2nd —> vars —> binompdf
