The mean of four numbers is 6. Three of them are 3.4,10.7and 7.8. what is the fourth number?
2 answers:
Answer:
2.1
Step-by-step explanation:
Use the equation
Sum of elements = average x number of elements
sum = (6)(4)
sum = 24
Add up the numbers we know: 3.4 + 10.7 + 7.8 = 21.9
24 - 21.9 = 2.1
This means the fourth number is 2.1
Answer:
2.1
Step-by-step explanation:
Let x be the 4th number. To find the mean add the 4 numbers and divide by 4
( 3.4 + 10.7+7.8+x) /4 = 6
Multiply each side by 4
( 3.4 + 10.7+7.8+x) /4 *4= 6*4
( 3.4 + 10.7+7.8+x) = 24
Combine like terms
x+21.9=24
Subtract 21.9 from each side
x = 24-21.9
x =2.1
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