Đo đường kính của 100 trục máy do 1 nhà máy sản xuất được bảng số liệu Đường kính ( cm) 9,75 9,8 9,85 9,0 số trục máy 5 37 42 16 hãy ước lượng trung bình đường kính của trục máy với độ tin cậy 97%

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.

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

Write the summation to estimate the area under the curve y = 1 + x2 from x = -1 to x = 2 using 3 rectangles and right endpoints