Assume that a sample is used to estimate a population mean μ
. Find the 98% confidence interval for a sample of size 61 with a mean of 25.9 and a standard deviation of 20.9. Enter your answer as an open-interval (i. e., parentheses) accurate to 3 decimal places.

98% C. I. =

Answer should be obtained without any preliminary rounding.

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.

100 points and 1- -12=y-36 2- x/25=-25 3- -n=40

Two trains leave a station on different tracks. the tracks make an angle of 130°, with the station as a vertex. the first train travels 100 km and makes its first stop at point a, while the second train travels 200 km and makes it first stop at point b. how far apart are the trains when both are at their first stop? round the answer to the nearest integer. a) 65 km b) 139 km c) 224 km d) 275 km