The contingency table below shows the results of a survey of video viewing habits by age. Video Viewing Platform Preferred Mobile/Laptop Viewer Age Device TV Screen Row Total 18 to 34 31 36 67 35 to 54 8. 8 16 55+ 11 17 Column Total 45 55 100 Find the following probabilities or percentages: (a) Probability that a viewer is aged 18 to 34. (Round your answer to 2 decimal places.) Probability (b) Probability that a viewer prefers watching videos on a TV screen. (Round your answer to 2 decimal places.) Probability

A survey conducted by a song rating service finds that the percentages of listeners familiar with "Poker Face" by Lady Gaga who would give the song ratings of 5, 4, 3, 2, and 1 are, respectively, 43 percent, 21 percent, 22 percent, 7 percent, and 7 percent. Assign the numerical values 1, 2, 3, 4, and 5 to the (qualitative) ratings 1, 2, 3, 4, and 5 and find an estimate of the probability distribution of x = this song’s rating by a randomly selected listener who is familiar with the song.   Find the expected value of the estimated probability distribution. (Round your answer to 2 decimal places.)

A software company is interested in improving customer satisfaction rate from the 74% currently claimed. The company sponsored a survey of 113 customers and found that 90 customers were satisfied.

A recent survey reports that 22% of students take the bus to campus. If 660 students commute to campusby bus, how many students participated in the study?

Please help answering this one:

In a sample of 169 students, 16 said they have donated blood. What percent of the students have donated blood?

Suppose that 9% of all athletes in a sport use a banned drug. A test is available that detects 94% of athletes who use the drug. But the test also gives a positive result for 8% of those who do not use the drug. What percent of athletes who test positive for the drug are actually using the drug? Answer: 77.28 %

Here are the fuel efficiencies (in mpg) of 15 new cars. 49, 35, 17, 21, 27, 23, 45, 50, 39, 51, 41, 47, 25, 14, 29 What is the percentage of these cars with a fuel efficiency less than 40 mpg?

A software company is interested in improving customer satisfaction rate from the 51% currently claimed. The company sponsored a survey of 157 customers and found that 89 customers were satisfied.

The Condé Nast Traveler Gold List for 2012 provided ratings for the top 20 small cruise ships.† The data shown below are the scores each ship received based upon the results from Condé Nast Traveler's Annual Readers' Choice Survey. Each score represents the percentage of respondents who rated a ship as excellent or very good on several criteria, including Itineraries/Schedule, Shore Excursions, and Food/Dining. An overall score was also reported and used to rank the ships. The highest ranked ship, the Seabourn Odyssey, has an overall score of 94.4, the highest component of which is 97.8 for Food/Dining. Ship Overall Itineraries/Schedule ShoreExcursions Food/Dining Seabourn Odyssey 94.4 94.6 90.9 97.8 Seabourn Pride 93.0 96.7 84.2 96.7 National Geographic Endeavor 92.9 100.0 100.0 88.5 Seabourn Sojourn 91.3 88.6 94.8 97.1 Paul Gauguin 90.5 95.1 87.9 91.2 Seabourn Legend 90.3 92.5 82.1 98.8 Seabourn Spirit 90.2 96.0 86.3 92.0 Silver Explorer 89.9 92.6 92.6 88.9…