南非雞
2023-2-21 02:17:55
試下諗清楚個每個condition既probability,b係at least one child is a boy = 3/4,d係1/2 其中一個child開,而每個child可以係男可以係女所以(0.5*0.5) + (0.5*0.5) = 0.5
both children are boys 既probability 永遠係1/4
by definition of conditional probability
given b:
p(both children are boys | b) = (1/4) / (3/4) = 1/3
given d:
p(both children are boys | d) = (1/4) / (1/2) = 1/2
連續擲就唔係呢個講法
你捱到去50下正面再覆我ok?