Statistics !
according to the current population survey, the following table summarizes probabilities for randomly selecting a full-time student in various age groups: age 15–17 18–24 25–34 35 or older older
probability 0.007 0.573 0.260 0.160
if we randomly select a full-time student, what is the probability that he/she is 25 or older?
a. 0.260
b. 0.420
c. 0.740
d. the answer is impossible to determine from the information given.

the expected value of the random variable : 0, 1 and 2

step-by-step explanation:

the required function is .

step-by-step explanation:

from the given table it is noticed that the graph passing through (-3,7), (0,4), (3,1) and (8,-4).

it is a linear function because the value of y is decrease by one as the value of x increase by 1.

the slope of the function is

the slope of the function is -1 and the y-intercept is 4.

the slope intercept form is

where, m is slope and b is y-intercept.

therefore the required function is . the graph of this function is shown below.