2x + 7y = 3
x = 1 - 4y

(5,-1)

Step-by-step explanation:

Since one of the equations gives x in terms of y , ie x = 1 - 4y

Then this can be substituted directly into the other equation.

→ 2(1 - 4y) + 7y = 3 → 2 - 8y + 7y = 3 → -y = 1 → y = -1

now, substitute y = -1 into x = 1 - 4y , to obtain x

→ x = 1 - 4(-1) = 1 + 4 = 5

Thus solution is (5 , -1 )

0.24

Explanation:

To find the population mean, add together all of the values in the population:

0+2+3+2+1+3+2+3+4+3+3+2+3+2+5+1+5+2+3+2+3+4+1+3+4 = 66

Now divide by the number of data points, 25:

66/25 = 2.64

To find the sample mean, add together all of the values in the sample:

0+2+3+3+4 = 12

Divide by the number of data points, 5:

12/5 = 2.4

The difference is 2.64-2.4 = 0.24