Average Problems( Week 23 Practice) 1. There are 6 math exams during the semester. Jackson has taken 5 exams so far and the scores were 88, 83, 89, 92, and 91. What will Jackson need to score on his final math exam to have an average score of 89 for the semester? 2. There are 3 groups of numbers. The first group has 3 numbers with an average of 7. The second group has 4 numbers with an average of 8 and the third group has 3 numbers with an average of 16. What is the average of all these numbers? 3. The average of 22 numbers is 11. One of numbers was then changed to 6. The average of all the numbers becomes 9 now. What was the number before it was changed? 4. There are 6 numbers. Their average is 16. The average of the first 4 numbers is 21. The average of the last 3 numbers is 14. 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 19 consecutive numbers is 15. What is the average of the first 5 numbers in the set? |