So mean is pretty easy to calculate; you just add everything up and divide by the number of things you added. Variance is pretty tricky because it involves subtracting the mean from each number, squaring that, adding all of the numbers up, and then dividing by the number of things. Then standard deviation is just the square root of the variance. Although some might enjoy spending hours figuring these out (I actually had to take a class where we only did this and stuff like it), most of us who use statistical tests do not want to waste our time on it. It is for that reason that there are websites that will compute all of these and all you have to do is put in the numbers. A pretty good one is:
http://www.calculator.net/standard-deviation-calculator.html
This one will calculate these and almost any other tests you need.
Now to your problem, if we add all of them up and divide by N (the # of things added), then we will get a mean of (μ=$5.10). From this, we can do further descriptive statistics. Standard Variance of the sample was calculated to (s^2=0.254). If we take the square root of the variance, we get a standard deviation of (s=0.504). I hope that this helps you with this problem and I hope that I helped for future problems by introducing the variance and standard deviation calculator to you!
Answer:
423
Step-by-step explanation:
Start by setting up a formula.
x = the shorter piece
total = 1313
longer piece = (x*2) + 44
x + (x*2) + 44 = 1313
Simplify
3x + 44 = 1313
Now we must solve for x.
Whatever you do on the left side of the equal sign must also be done on the right.
The goal is to get x by itself on the left side.
Do the easiest thing first, which is usually addition or subtraction. In this case, subtract 44 from both sides.
3x + 44 - 44 = 1313 - 44
3x = 1269
Now the only way to cancel out the 3 on the left is to divide by 3. Since 3/3 =1. Remember this must be done on both sides to keep things equal.
3x/3 = 1269/3
x=423
The End
Do 42 divided by 15 then divided 12 by the awnser. And you do 42 divided by 28 and divided that by 12 I think I'm pretty sure
Answer:
3 5/9
Step-by-step explanation
you flip 9/8 to 8/9 and multiply... you get 32/9=3 5/9
