The sample size needed to estimate a population mean to within 10 units was found to be 68. If the population standard deviation was 50, then the confidence level used was:

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!