5.2 The median annual income for household heads in a certain city is $28,000. Four such household...

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5.2 The median annual income for household heads in a certain city is $28,000. Four such household heads are randomly selected for an opinion poll.

a Find the probability distribution of X, the number

(out of the four) that have annual incomes below $28,000.

b Would you say that it is unusual to see all four below $28,000 in this type of poll? (What is the probability of this event?)

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