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American adults prefer saving over spending

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According to a Gallup poll, 60% of American adults prefer saving over spending. Let X = the number of American adults out of a random sample of 18 who prefer saving to spending. Find

(i) The mean of this binomial distribution.

(ii) Standard deviation of this binomial distribution.

(iii) What is the probability that exactly 12 American adults prefer saving over spending.

Reference no: EM131960905

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