Getting at least one head when tossing nine fair coins

Explanation:

Let A represent "getting at least one head in 9 tosses"

Then   is "getting no heads in 9 tosses"

P(A) = 1 - P(Â)

 only occurs when all tosses are tails (TTT TTT TTT), so there is only one option of getting no heads.

There are a total of 2⁹ possible outcomes.

So, P(A) = 1 -

             =   -

            =  

             =

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3