Average Problems( Week 23 Practice) 1. There are 6 math exams during the semester. Josh has taken 5 exams so far and the scores were 80, 98, 83, 84, and 81. What will Josh need to score on his final math exam to have an average score of 85 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 10 and the third group has 9 numbers with an average of 10. What is the average of all these numbers? 3. The average of 43 numbers is 11. One of numbers was then changed to 3. The average of all the numbers becomes 8 now. What was the number before it was changed? 4. There are 8 numbers. Their average is 18. The average of the first 5 numbers is 17. The average of the last 4 numbers is 20. What is the 5th 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 17 consecutive numbers is 13. What is the average of the first 9 numbers in the set? |