According to a survey of 100 students in a certain university, 25 students are fans of Ravens. (a) Calculate a 95% confidence interval for the proportion of students that are fans of Ravens. (b) Interpret the interval you just found in part (a). (c) Assuming no any available information, how large a sample size is necessary if we want a 95% confidence interval with a width of 10%?

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?