Asecond-stage smog alert has been called in a certain area oflos angeles county in which there are 50 industrial firms. aninspector will visit 10 randomly selected firms to check forviolations of regulations. a. if 15 of the firms are actually violating at least oneregulation, what is the pmf of the number of firms visited by theinspector that are in violation of at least one regulation? b. if there are 500 firms in the area, of which 150 are inviolation, approximate the pmf of part (a) by a simpler pmf. c. for x=the number among the 10 visited that are inviolation, compute e(x) and v(x) both for the exact pmf and theapproximating pmf in part (b)

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

the answer is 54 sq. ft. i just did this question, on odyssey ware, and it was right. make brainliest.