According to a study by the Centers for Disease Control and Prevention, about 33% of U.S. births are Caesarean deliveries. Suppose seven expectant mothers are randomly selected. What is the standard deviation of the number of mothers who will have a Caesarean delivery? Multiple Choice 2.31 1.244 1.548 5.336
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To find the standard deviation of the number of mothers who will have a Caesarean delivery among seven expectant mothers, we can use the properties of a binomial distribution. Show more…
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According to a study by the Centers for Disease Control and Prevention, about 33% of U.S. births are Caesarean deliveries. Suppose seven expectant mothers are randomly selected. What is the probability that at most two of the expectant mothers will have a Caesarean delivery? 0.5783 0.2696 0.4217
Supreeta N.
Caesarian births. A medical research reports that $75 \%$ of all births in a certain region take place by Caesarian section each year. a. In a random sample of 1,000 births, how many, on average, will take place by Caesarian section? b. What is the standard deviation of the number of Caesarian section births in a sample of 1,000 births? c. Use your answers to parts a and $\mathbf{b}$ to form an interval that is likely to contain the number of Caesarian section births in a sample of 1,000 births.
Suppose that 29% of all births in a certain region take place by Caesarian section each year. a. In a random sample of 800 births, how many, on average, will take place by Caesarian section? b. What is the standard deviation of the number of Caesarian section births in a sample of 800 births? c. Use your answers to parts a and b to form an interval that is likely to contain the number of Caesarian section births in a sample of 800 births. a. On average, out of 800 births will take place by Caesarian section. (Round to the nearest whole number as needed.) b. The standard deviation in a sample of 800 births is. (Round to two decimal places as needed.) c. The number of Caesarian section births is 95% likely to be in the interval ( , ) using the empirical rule. (Round to one decimal place as needed.)
Ana Carolina D.
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