A lawyer researched the average number of years served by
45 different justices on the Supreme Court. From this sample,
he found that the average number of years served was 13.8
years with a sample standard deviation of 7.3 years. What is the
95% confidence interval for the average number of years
served by all Supreme Court justices?

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

What is the value of x? enter your answer in the box. photo attached.

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?