A random sample is made of 256 middle managers concerning their annual incomes. The sample mean is computed to be $35,420. If the population standard deviation is $2,050. What is the standard error of the mean? a. $128.125
b. $138.36
c. $2.050
d. $8.01

a. $128.125

Step-by-step explanation:

The standard error of the mean is given by :

, where = population standard deviation , n= sample size.

Given:

n= 256

Then, the standard error of the mean:-

Hence, option a. is correct.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

it has the same slope and a different y-intercept

hope this : )