Can my tutor please explain and answer all of the following questions.

CO PEACE Problem 12. (3 points) A survey found that 75% of Americans favor spending government money to develop alternative sources of fuel for automobiles. For a random sample od 150 Americans, find the fuel. mean, variance, and standard deviation for the number who favor government spending for alternative Problem 13. (4 points) A salaries at the corporation are normally distributed with an average salary of $25,000 and a standard deviation of $2,500. What is the probability that random selected employee will have a salary greater than $24,800? Step 1: (2 points) State the desired probability: Step 2: (3 points) Convert values to z - scores: Step 3: (3 points) Find the probability: Problem 14. (5 points) A recent survey of 400 people found that 350 of them own a smartphone. Find the 99% confidence interval of the population proportion. 7 Dago WACE Problem 15. A film editor feels that the standard deviation for the number of minutes in a video is 2.4 minutes. A sample of 30 videos has a standard deviation 3.2 minutes. At 0.05 level of significance, is the sample standard deviation different from what the editor hypothesized? Step 1: (3 points) Write the null hypothesis and the alternative hypothesis and identify the claim. Step 2: (2 points) Find the test value: Step 3: (2 points) Find the critical value(s): Step 4: (2 points) Make the decision. Step 5: (1 point) Summarize the result