Hello, I need solving this. preferably on screen not paper

11. Data on investments in the high-tech industry published in America's Network Telecom Investor. A random sample of 18 venture-capital investments in the fiber optics business sector yielded the following date, in millions of dollars 5.06 6.27 5.96 10.51 2.04 5.48 5.74 5.58 4.13 8.63 5.95 6.67 4.21 7.71 9.21 4.98 8.64 6.66 Of all venture capital investments in the fiber optics business sector Determine and interpret a 95% confidence interval for the mean amount . Assume that population standard deviation is $2.04 million. (Note: the sum of that data is 113.97 million) 12. For the following data: xbar=30, n=25, s=4, confidence level =90% a) Use the one-mean t-interval procedure to find a confidence interval for the mean of the population from which the sample was drawn (Estimate the mean) b) Obtain the marginal error by using the formula