Average Problems( Week 23 Practice) 1. There are 6 math exams during the semester. Ben has taken 5 exams so far and the scores were 88, 94, 83, 97, and 95. What will Ben need to score on his final math exam to have an average score of 93 for the semester? 2. There are 3 groups of numbers. The first group has 4 numbers with an average of 8. The second group has 3 numbers with an average of 7 and the third group has 3 numbers with an average of 17. What is the average of all these numbers? 3. The average of 41 numbers is 12. One of numbers was then changed to 5. The average of all the numbers becomes 9 now. What was the number before it was changed? 4. There are 5 numbers. Their average is 18. The average of the first 2 numbers is 16. The average of the last 4 numbers is 21. What is the 2nd 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 11. What is the average of the first 3 numbers in the set? |