TAILIEUCHUNG - Number operation review 4

Tham khảo tài liệu 'number operation review 4', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | --------------------------- NUMBERS AND OPERATIONS REVIEW ---------------------------------------- Sets Sets are collections of certain numbers. All of the numbers within a set are called the members of the set. Examples The set of integers is . 3 2 1 0 1 2 3 . . The set of whole numbers is 0 1 2 3 . . Intersections When you find the elements that two or more sets have in common you are finding the intersection of the sets. The symbol for intersection is A. Example The set of negative integers is . 4 -3 2 1 . The set of even numbers is . -4 -2 0 2 4 . . The intersection of the set of negative integers and the set of even numbers is the set of elements numbers that the two sets have in common . -8 -6 -4 -2 . Practice Question Set X even numbers between 0 and 10 Set Y prime numbers between 0 and 10 What is X A Y a. 1 2 3 4 5 6 7 8 9 b. 1 2 3 4 5 6 7 8 c. 2 d. 2 4 6 8 e. 1 2 3 5 7 Answer c. X A Y is the intersection of sets X and Y. The intersection of two sets is the set of numbers shared by both sets. Set X 2 4 6 8 . Set Y 1 2 3 5 7 . Therefore the intersection is 2 . Unions When you combine the elements of two or more sets you are finding the union of the sets. The symbol for union is u. Example The positive even integers are 2 4 6 8 . . The positive odd integers are 1 3 5 7 . . If we combine the elements of these two sets we find the union of these sets 1 2 3 4 5 6 7 8 . . 59 --------------------------- NUMBERS AND OPERATIONS REVIEW ------------------------------------------ Practice Question Set P 0 -7 4 22- Set Q 4 What is P u Q a. 4 b. f c. 0 4 d. 0 -7- 27i e. 0 -7- 4 27 i Answer e. P u Q is the union of sets P and Q. The union of two sets is all the numbers from the two sets combined. Set P 0 -7 4 -2y . Set Q 4 . Therefore the union is 0 -7 4 . Mean Median and Mode To find the average or mean of a set of numbers add all of the numbers .

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