Tag: probability

Solved (Free): Students in a high school can choose to study Spanish or French as a foreign language

Students in a high school can choose to study Spanish or French as a foreign language. In a given academic year, 90% of the pupils choose Spanish and the rest…

Solved (Free): In a study, physicians were asked what the odds of breast cancer would be in a woman who was initially thought to have

In a study, physicians were asked what the odds of breast cancer would be in a woman who was initially thought to have a 1% risk of cancer but who…

Solved (Free): The probability that first processing machine is not working properly at any time is 0.07

The probability that first processing machine is not working properly at any time is 0.07, and the probability that the second machine is not working properly at any time is…

Solved (Free): A study of drinking and driving has found that 40% of all fatal auto accidents are attributed to drunk drivers

A study of drinking and driving has found that 40% of all fatal auto accidents are attributed to drunk drivers, 2% of all auto accidents are fatal, and drunk drivers…

Solved (Free): A site is composed of 60% sand and 40% silt in separate layers and pockets. At this site

A site is composed of 60% sand and 40% silt in separate layers and pockets. At this site, 10% of sand samples and 5% of silt samples are contaminated with…

Solved (Free): It is estimated that 50% of emails are spam emails. Some software has been applied to filter these spam emails before they reach your inbox

It is estimated that 50% of emails are spam emails. Some software has been applied to filter these spam emails before they reach your inbox. A certain brand of software…

Solved (Free): It is estimated that, during the past year, 27% of all adults visited a therapist and 45% of all adults used non-prescription

It is estimated that, during the past year, 27% of all adults visited a therapist and 45% of all adults used non-prescription antidepressants. It is also estimated that 21% of…

Solved (Free): Of the 10,000 students at a certain university, 7000 have Visa cards, 6000 have MasterCards

Of the 10,000 students at a certain university, 7000 have Visa cards, 6000 have MasterCards, and 5000 have both. Suppose that a student is randomly selected. a. What is the…

Solved (Free): A construction company has recently built a hotel. The probability that the new hotel will get an award for its design is 0.28

A construction company has recently built a hotel. The probability that the new hotel will get an award for its design is 0.28, and the probability that it will get…

Solved (Free): A manufacturer claims that its drug test will detect steroid use (that is, show positive for an athlete who uses steroids) 95% of the time

A manufacturer claims that its drug test will detect steroid use (that is, show positive for an athlete who uses steroids) 95% of the time. What the company does not…