According to the 2010 U. S. Census, 24% of U. S. residents are under 18 years old. Suppose we take a random sample of 500 U. S. residents. Let X = the number of people in the sample who are under 18 years old. 1. Calculate the mean and standard deviation of the sampling distribution of X.
2. Interpret the standard deviation from part (a).
3. Justify that it is appropriate to use a normal distribution to model the sampling distribution of X.
4. Using a normal distribution, calculate the probability that the number of people under 18 years old in a random sample of size 500 is between 100 and 110.

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet

srry ask agian

step-by-step explanation:

p

step-by-step explanation: