The following table shows the data collected from a random sample of 100 middle school students on the number of hours they play indoor games every week: weekly duration of indoor games time (in hours) 0–3 4–7 8–11 12–15 number of students 4 42 52 2 there are 1,300 students in the school. based on the sample proportion, how many students in the school would be expected to play indoor games for at least four hours every week? 546 598 702 1,248

4friends evenly divided up a n-slice pizza. one of the friends, harris, ate 1 slice than he received. how many slices of pizza did harris eat? as an expression

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.

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?