For a population with a mean of 45 and standard version of 10, what is the standard error of the dustribution of sample means for n=4 scores

The jones farm has 24 cows that each produce 52 quarts of milk a day. how many quarts are produced each day altogether

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.

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?