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Show all work!!
The mean of four numbers is 10. If three of the numbers are 7, 8, and 11, what is the fourth number?
回答 (18)
2015-06-01 6:14 am
14, I'd imagine.
in this problem, you have 4 numbers which have to add up to be 40........ because when you divide that by 4, you get 10.
in this problem, you have 4 numbers which have to add up to be 40........ because when you divide that by 4, you get 10.
2015-06-01 6:46 am
Why the hell would I do a child's homework?
2015-06-01 6:46 pm
The average number is 10 so 2 numbers must be a number of less than 10 and 2 must be the same number but of more than 10
from 7 and 8 you are 5 away from 10
from 11 you are 1 away from 10
therefore the missing number must be 14 because 4 + 1 = 5 away from 10
from 7 and 8 you are 5 away from 10
from 11 you are 1 away from 10
therefore the missing number must be 14 because 4 + 1 = 5 away from 10
2015-06-01 10:36 am
(7 + 8 + 11 + x)/4 = 10
26 + x = 40
x= 14
26 + x = 40
x= 14
2015-06-01 7:19 am
If X is the 4 th number , then arithmatic mean number of these 4 numbers of 7, 8 , 11 and X can be equated as ; 7 + 8 + 11 + X / 4 = 10 , then by simplifying 26 + X = 40 , So , X = 40 - 16 = 14 , therefore the 4 th number is 14 , putting the value of X = 14 in the above equation we get LHS in the equation :(7 + 8 + 11 + 14) / 4 = 40 / 4 = 10 as mean average which tallies with RHS of the equation .
2015-06-02 5:21 am
show all work? such trivial problem can be solved by inspection.
if you can't multiply 10 by 4, then subtract (8+7) and 11 from it in your head to get 14, you need to restudy fundamental arithmetic
if you can't multiply 10 by 4, then subtract (8+7) and 11 from it in your head to get 14, you need to restudy fundamental arithmetic
2015-06-01 7:23 pm
7 + 8 + 11 + x = 40
= 26 + x = 40
x = 40-26
x = 14
= 26 + x = 40
x = 40-26
x = 14
2015-06-01 2:15 pm
x = 14.
2015-06-01 10:39 am
(7 + 8 + 11 + x)/4 = 10. Therefore x = (4)(10) - (7 + 8 + 11) = 40 - 26 = 14. End of story.
2015-06-01 6:29 am
You have :
-----------------
xbar = ( x1 + x2 + x3 + x4 ) / ( 4 )
( 4 ) ( xbar ) - x1 - x2 - x3 = x4
x4 = ( 4 ) ( 10 ) - 7 - 8 - 11 )
x4 = 40 - 7 - 8 - 11 = 40 - 26 = 14 <--------------
-----------------
xbar = ( x1 + x2 + x3 + x4 ) / ( 4 )
( 4 ) ( xbar ) - x1 - x2 - x3 = x4
x4 = ( 4 ) ( 10 ) - 7 - 8 - 11 )
x4 = 40 - 7 - 8 - 11 = 40 - 26 = 14 <--------------
2015-06-01 6:19 am
(7+8+11+x)/4=10
Multiply both sides by 4
7+8+11+x=10*4
Subtract 7+8+11 from both sides
x=10*4-(7+8+11)
Simplify
x=14
Multiply both sides by 4
7+8+11+x=10*4
Subtract 7+8+11 from both sides
x=10*4-(7+8+11)
Simplify
x=14
2015-06-04 2:31 pm
Let the fourth number is 'x'
then( 7+8+11+x)/4 = 10
7+8+11+x = 10*4
7+8+11+x = 40
x = 40-7-8-11
x = 14
then( 7+8+11+x)/4 = 10
7+8+11+x = 10*4
7+8+11+x = 40
x = 40-7-8-11
x = 14
2015-06-02 9:17 pm
7+8+11+x=10*4
x=40-26
=14
x=40-26
=14
2015-06-02 3:56 pm
For 7, 8, and 11 the differences from the mean, 10, are -3, -2 and +1 total -4.
So the difference for the last number = +4
10+4 = 14.
So the difference for the last number = +4
10+4 = 14.
2015-06-02 1:52 am
(7 + 8 + 11 + N)/4 = 10
7 + 8 + 11 + N = 40
N + 26 = 40
N = 14
7 + 8 + 11 + N = 40
N + 26 = 40
N = 14
2015-06-01 12:31 pm
10 × 4 - (7 + 8 + 11)
= 40 - 26
= 14
The fourth number is 14.
= 40 - 26
= 14
The fourth number is 14.
2015-06-01 6:44 am
Mean of 4 numbers = 10 means sum of those numbers = 10 x 4
Let the no. to be found be x
7 + 8 + 11 + x = 40
= 26 + x = 40
x = 40-26
x = 14
Let the no. to be found be x
7 + 8 + 11 + x = 40
= 26 + x = 40
x = 40-26
x = 14
2015-06-01 10:23 am
sum of the numbers mean addition in math operation.
7+8+11+x=10
X= 10-26
X= -16
7+8+11+x=10
X= 10-26
X= -16
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