We have that
set of data [<span>8, 12, 15, 17, 18]
step 1
Find the mean
</span>[8+ 12 + 15 + 17 + 18]/5-------> 70/5------> 14
step 2
for each number: subtract the Mean and square the result
(8-14)²----->36
(12-14)²----> 4
(15-14)²----> 1
(17-14)²----> 9
(18-14)²----> 16
step 3
<span> work out the mean of those squared differences
[36+4+1+9+16]/5-----> 66/5-----> 13.2----> </span><span>this value is called the "Variance"
step 4
</span><span>Take the square root of that
</span>standard desviation=√13.2-----> 3.63-------> 4
the answer is
4
It's going to be the first one...
How you solve this is just insert the number of hours you want for X then solve the equation.
15 * 1 = 15
15 + 30 = 45
15 * 3 =45
45 + 30 = 75
I am numbering the clocks 1 through 8 going left to right on both rows...
Clock 8 goes to 1:35
Clock 7 goes to 2:25
Clock 6 goes to 7:05
Clock 5 goes to 11:55
Clock 4 goes to 2:20
Clock 3 goes to 4:20
Clock 2 goes to 1:40
Clock 1 goes to 11:50
X(x-7)=0
⇔x=0 or x-7=0
⇔x=0 or x=7
ok so dimensions is like area the dimensions of a cubes side is a one by one or the base and height of a cube is 1 inch each get it now or do you need me to explain more?
