Average Problems( Week 23 Practice) 1. There are 6 math exams during the semester. Jay has taken 5 exams so far and the scores were 81, 96, 82, 95, and 99. What will Jay need to score on his final math exam to have an average score of 88 for the semester? 2. There are 3 groups of numbers. The first group has 4 numbers with an average of 9. The second group has 3 numbers with an average of 10 and the third group has 3 numbers with an average of 11. What is the average of all these numbers? 3. The average of 32 numbers is 8. One of numbers was then changed to 2. The average of all the numbers becomes 7 now. What was the number before it was changed? 4. There are 9 numbers. Their average is 19. The average of the first 4 numbers is 23. The average of the last 6 numbers is 16. What is the 4th number? 5. Consecutive numbers are natural numbers that follow in order, such as 1,2, 3, 4, 5,..., and so forth. Suppose the average of 11 consecutive numbers is 9. What is the average of the first 5 numbers in the set? |