12 schools or districts in a country use digital content such as ebooks, audio books, and digital textbooks. Of these 85%, 4 out of ir curriculum. Find the probability that a randomly selected school or district uses digital content and uses it as part of their selected school or district uses digital content and uses it as part of their curriculum is. as needed.)

Assume that when adults with smartphones are randomly​ selected, 58 ​% use them in meetings or classes. If 9   adult smartphone users are randomly​ selected, find the probability that at least 7   of them use their smartphones in meetings or classes.

A manufacturing machine has a 8% defect rate. If 6 items are chosen at random, what is the probability that at least one will have a defect?

According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 According to the historical data, the life expectancy in Argentina is equal to the life expectancy in Bolivia. A new study has been made to see whether this has changed. Records of 225 individuals from argentina who died recently are selected at random. The 225 individuals lived an average of 77.4 years with a standard deviation of 6.7 years. Records of 300 individuals from Ireland who died recently are selected at random and independently. The 300 individuals lived a mean of 76.5 years with a standard deviation of 5.3 years. Assume that the population standard deviations of lifetimes in these two countries can be estimated by the sample standard deviations, as the samples used were quite large. Construct a 90% confidence interval for , the difference between the life expectancy in the United States and…