In a meeting, every American handshakes with every Japanese just once, every Japanese handshakes with every Russian just once and every Russian handshakes with every American just once. If the total number of handshakes in the meeting is 146, then what is the minimum number of people present in the meeting? pls urgent correct answer with explanation gets brainliest

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