Sam can clean his room in 3 hours. His sister, Susan, can clean his room in 2 hours. How long will it take them to clean the room working together? This is a rational equation problem

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population, find the population standard deviation, o.79828588912497

Use set buikder notation to represent the following set: {, -2, -1, 0}

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.