Lactose intolerance affects about 20% of non-Hispanic White Americans and 50% of White Hispanic Americans. Nine percent

Question:

Lactose intolerance affects about 20% of non-Hispanic White Americans and 50% of White Hispanic Americans. Nine percent of Americans are Hispanic Whites, and 75.6% are non-Hispanic Whites. If a White American is chosen at random and is lactose-intolerant, what is the probability that he or she is Hispanic?

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