1. A college professor administered a unit exam to one of his classes and found that the majority of the items were too easy. The scores are 45, 39, 40, 48, 35, 37, 36, 37, 40, 44, 41, 49, 29, 28, 32, 36, 37, 41, 40, 36, 39, 30, 25, 43, and 50. Calculate the mean.

2. The Department of Agriculture conducted a survey of farmers in Ilocos Norte. The following is the list of acres farmed by a sample of 20 farming families through-out the province: 200, 1200, 300, 350, 500, 550, 1500, 400, 500, 800, 850, 1300, 2000, 2100, 340, 760, 830, 2670, 990, and 3000. Calculate the median.

3. A sales manager would like to see each of his sales representative unit sales per month. A new recruit is told to keep a weekly record of the sales. The following are the data from the previous month: 10, 14, 17, 18, 30, 28, 27, 38, 16, 5, 8, 19, 28, 17, 21, 23, 43, 21, 26, 28, 16, 6, 15, and 10. Calculate the mode.

4. A professor grades students on 4 quizzes, a project, and a final examination. Each quiz counts as 12% of the quiz grade. The project counts as 22% of the course grade. The final examination counts as 30% of the course grade. Achaiah has quiz scores of 75, 80, 85, and 90. His project score is 95 and his final examination score is 92. Use the weighted mean formula to find Achaiah's average for the course.