Average Problems( Week 23 Practice) 1. There are 6 math exams during the semester. Edward has taken 5 exams so far and the scores were 92, 86, 80, 90, and 96. What will Edward 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 5 numbers with an average of 9. The second group has 6 numbers with an average of 8 and the third group has 9 numbers with an average of 13. What is the average of all these numbers? 3. The average of 24 numbers is 14. One of numbers was then changed to 4. The average of all the numbers becomes 11 now. What was the number before it was changed? 4. There are 6 numbers. Their average is 15. The average of the first 4 numbers is 12. The average of the last 3 numbers is 23. 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 7. What is the average of the first 9 numbers in the set? |