The number, , of people who have heard a rumor spread by mass media by time t is modeled by (t)=a(1−e−bt). There are 100,000 people in the population who hear the rumor eventually. If 20% of them heard it the first day, find b, assuming t is measured in days. Give your answer to three decimal places.

You are on a cycling trip around europe with friends. you check the weather forecast for the first week. these are the temperatures for the week. sun mon tues wed thurs fri sat 16°c 20°c 24°c 28°c 28°c 23°c 15°c what is the mean temperature forecast for the week?

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class