An automobile service facility specializing in engine tune-ups knows that 60% of all tune-ups are done on four-cylinder automobiles, 30% on six-cylinder automobiles, and 10% on eight-cylinder automobiles. Let X = the
number of cylinders on the next car to be tuned. What is the pmf of X?
Suppose that a lake is stocked with N fish of the same age, and that M is the mortality rate of the fish (the fraction of the fish that will die of natural causes during the year), and F is the fishing rate (the fraction that will be caught commercially). Then the number of fish C that will be caught during the year is given by the formula
C=FN/ M+F;
in this formula, M and F must be entered as decimal values.
(a) Suppose that the lake is stocked with 5500 catfish at the beginning of the season and that the fish have a 7% mortality rate. If the catfish are removed at a fishing rate of 25%, what are the appropriate values of the quantities N, M and F in this situation? Use these to determine how many catfish will be caught by fishing from the lake.
(b) Treat N and M as parameters with the same values given above. Then complete this table of function values of C in terms of F :
(c) If this function C = C(F) were graphed, would it be an increasing or decreasing function? Would it…
If an antibiotic is taken orally, only a fraction of the antibiotic is actually absorbed in the bloodstream. This
fraction is called bioavailability of the dose.
Suppose that for a specific antibiotic, when a mg is taken orally, only 50% of the dose is absorbed, that is the
bioavailability can be expressed as
2
I.
Now, if h mg of antibiotic enters the bloodstream, the amount eventually absorbed at the site of the infection
4h
is g(h) =
mg.
h+ 4
!!
Finally, if g mg is absorbed into the site of the infection, the number of surviving bacteria is given by
3000
f(9) =
CFU (colony forming units).
%3D
9+g?
a) If a dose of 8 mg is given orally, compute the amount of antibiotic absorbed at the site of infection.
An
er:
mg. Round to 1 decimal place as needed.
b) If an amount of 7 mg enters the bloodstream, compute the amount that is eventaully absorbed at the site
of the infection.
Answer:
mg. Round to1 decimal place as needed.
c) If a dose of 6 mg is injected directly into the bloodstream…
Chapter 5 Solutions
Thomas' Calculus and Linear Algebra and Its Applications Package for the Georgia Institute of Technology, 1/e
College Algebra with Modeling & Visualization (6th Edition)
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