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A report by CNN in February 2007 stated that only 40% of adult Americans have separate
savings for an emergency. For a random sample of 120 adult Americans, what is the expected
number that will have separate savings for an emergency?
Solution
P(Adults having seperate savings) = 0.4
Sample size n =120
The binomial distribution has the following properties:
The expected number (or mean) of the distribution (x) is equal to n * P = 120 * 0.4 = 48 Answer

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  • 1. A report by CNN in February 2007 stated that only 40% of adult Americans have separate savings for an emergency. For a random sample of 120 adult Americans, what is the expected number that will have separate savings for an emergency? Solution P(Adults having seperate savings) = 0.4 Sample size n =120 The binomial distribution has the following properties: The expected number (or mean) of the distribution (x) is equal to n * P = 120 * 0.4 = 48 Answer