8. it has been estimated that about 18.5% of adults whose income is below the poverty level work full-time throughout the year. a random sample of 150m people whose poverty level meets the criteria have been chosen

a. what is the expected value?

b. calculate the standard deviation

The expected value is 27.75 million and standard deviation is 81.5%

Explanation:

Given the sample was selected from the population

The population was of 150 million people

(a) Expected Value

Given that the adults whose income is below poverty line is 18.5%

Expected value = 18.5% of 150 million

=

= 27.75 million

Therefore, the expected value is 27.75 million

(b) Standard deviation

Standard deviation =  

Standard deviation is 81.5%

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is