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Sagot :
To get the mean, you add all of the numbers, and then divide the answer by the number of numbers.
15+(-6)= 9
9+12= 21
(21+x= q )⬅️ignore this for now, that's where the unknown number would have been
The mean = 5, and the number of numbers is 4, so basically, you find 5•4=20
So take the 21 from before, and if you add -1, you get 20!
So, x= ➖1⃣!!!!!!! (That's a -1)
15+(-6)= 9
9+12= 21
(21+x= q )⬅️ignore this for now, that's where the unknown number would have been
The mean = 5, and the number of numbers is 4, so basically, you find 5•4=20
So take the 21 from before, and if you add -1, you get 20!
So, x= ➖1⃣!!!!!!! (That's a -1)
mean = sum of all numbers / no of numbers
so u have mean and three of ur numbers given
then
5=(15-6+12+x)/4 x is the number u need to find
then
20= 15-6+12+x multiplying both sides by 4
20=21+x addition and subtraction
20-21=x
x= -1
so u have mean and three of ur numbers given
then
5=(15-6+12+x)/4 x is the number u need to find
then
20= 15-6+12+x multiplying both sides by 4
20=21+x addition and subtraction
20-21=x
x= -1
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