Oscar and his band wants to record and sell CDs. There will be a set-up fee of 400 and each CD will cost 3.75 to burn. The recording studio requies bands to make a minimum purchase of 1000. What id the minmum number of CDs the band can burn to meet the minimum purchase of 1000. Define your variables and write and solve an inequality to solve this problem

A. find the power of the test, when the null hypothesis assumes a population mean of mu = 450, with a population standard deviation of 156, the sample size is 5 and the true mean is 638.47 with confidence intervals of 95 b. find the power of the test, when the null hypothesis assumes a population mean of mu = 644, with a population standard deviation of 174, the sample size is 3 and the true mean is 744.04 with confidence intervals of 95% c. find the power of the test, when the null hypothesis assumes a population mean of mu = 510, with a population standard deviation of 126, the sample size is 10 and the true mean is 529.44 with confidence intervals of 95