Here Binomial distribution to be used because two mutually exclusive outcomes occurrence(here attempting the advanced terrain) and non-occurrence(here not attempting the advanced terrain) are possible for each visitor
Here the formula used is the Probability mass function of binomial distribution
P(X=x) = where p is the probability of success, q= (1-p) probability of failure, r = 0,1,2,…..,n
Here in all cases n =20
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