In a school district 85% of children are covered by some type of health insurance. If 4 children are selected at random, what is the probability that none are covered.

The answer would be b

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.