Question

Helpp

Find an expression for the mean and standard deviation for the following data. Complete the calculations algebraically. 4a+6b a-b a+b 2a-2b

Answer 1

I found the mean

=4a+6b + a-b + a+b + 2a-2b
=8a + 4b / 4
=2a+b

does anyone know how to find the standard deviation?

Answer 2

√{[1/(n - 1)]Σ(x - Mean)²}
calculate this first
Σ(x - Mean)²

Answer 3

are you familiar with these ?

Answer 4

I did and I ended up with
s=\[\sqrt{2a ^{2}}+8ab+\frac{ 38 }{ 3 }b ^{2}\]

Answer 5

I don't know if its right

Answer 6

@RED123url ?

Answer 7

the whole expression is under the square root

Answer 8

yea that's what I have

Answer 9

Thanks :)

Answer 10

you are welcome