Bentley started the month with $652.45 in his checking account. He had withdrawals of $57.80, $139.28 and $256.62. He was paid twice during the month and deposited $468.29 and $365.78. The bank charges $9.87 a month for transaction fees. How much money is in Bentley's checking account at the end of the month? Use a $ sign in your answer.

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