X 4 5 6 7 8 9
PX 0.08 0.18 0.22 0.15 0.16 0.21
2) Based on a Harris poll, among adults who regret getting tattoos, 25% say that they were too young when they got their tattoos. Assume that 12 adults who regret getting tattoos are randomly selected.
3) An egg carton contains 24 eggs, 5 of which are cracked. We pick 8 eggs for boiling.
4) The life span of oil-drilling bits depends on the types of rock and soil that the drill encounters, but it is estimated that the mean length of life is 75 hours. Suppose an oil exploration company purchases drill bits that have a life span that is approximately normally distributed, with a mean equal to 70 hours and a standard deviation equal to 14 hours.
5) Standing eye heights of women are normally distributed with a mean of 1564 mm and a standard deviation of 60 mm.
6) A classic example of the Poisson distribution involves the number of deaths caused by horse kicks of men in the Prussian Army between 1875 and 1894. Data for 14 corps were combined for the 20-year period, and the 280 corps-year included a total of 196 deaths.
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