Hey 9-05, Mr.B assigned me question number 27. If I have any mistakes please comment and help me out! Please and thank you (:
27. The mean of six rational numbers is -4.3.
a)What is the sum of the rational numbers?
The sum is -25.8.
If you're wondering how I got my answer, all I did was multiply -4.3 with 6. Why did I multiply with 6? The statement above says the mean of six rational number is -4.3. To find the mean you have to add all the numbers and divide the sum by six. When you divide -25.8 by six the answer will be -4.3.
b)If five of the numbers each equal -4.5, what is the sixth number?
The sixth number will be -3.3.
The question tells us that five of the numbers equal -4.5. So I multiplied -4.5x5 and it gives me -22.5. If the sum is -25.8 you just have subtract -22.5 and you get -3.3. So if we multiply -4.5 with 5 and add -3.3 you get -25.8 (the sum) and if you divide -25.8 you get -4.3.
Okay, Im done. But please don't forget to comment and find my mistakes if I have any. Thanks you guys! (: