The mean of four numbers is 7. Three of the numbers are 5,7 and 7. What is the fourth number?
2 answers:
Answer:
9 is the fourth number.
Step-by-step explanation:
9 is the fourth number because 7(mean) x 4(amount of numbers) = 28 and 7 plus 7 plus 5 plus 9 equals 28 so when you divide you get 7.
Answer:
fourth number is 9
Step-by-step explanation:
let 'x' equal the fourth number
(5+7+7+x)/4 = 7
cross-multiply to get:
19 + x = 28
x = 9
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Step-by-step explanation:
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