So first you have to find the median, to do this you use the formula (n+1)/2 with n being how many numbers there are.
As there are 4 numbers we can substitute it into the formula to make (4+1)/2 which is 2.5
Then you find the 2nd place and the 3rd place (which are 5 and 8) and find exactly the middle of them which is 6.5 (the median)
To find the lower quartile we take the 2.5 from earlier and divide it by 2 to make 1.25 so we find where that place is in the number. 4 is the first place and then we find what 1/4 is and add that on to make 4.25 which is the lower quartile.
Then you do 2.5+1.25 to find the upper quartile to make 3.75 so we find where that is in the numbers which is in-between 8 and 13 so it will be 8+1.22 to make 9.22
So to find the interquartile range you do the upper quartile takeaway the lower quartile so 9.22-4.25 which is 4.97 and that is the answer
since r is positive, the correlation is also positive also, since r is closer to 0 than 1, the correlation is weak
X is equal to 11/30 because, using basic moves, you subtract the 2 4/5 from either side to get x by itself. So 3 1/6 - 2 4/5 = 11/30. Then you are left with x = 11/30.
11 centimeters
This is because a rectangle has an area of length times width and so you can divide 88 by 8 to get 11
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