Spread of a rumor. The rumor “People who study math all get scholarship” spreads across a college campus. Data in the following table show the number of students N who have heard the rumor after time t , in days. Time, t (in days) Number, N , Who Heard the Rumor 1 1 2 2 3 4 4 7 5 12 6 18 7 24 8 26 9 28 10 28 11 29 12 30 a. Use REGRESSION to fit a logistic equation, N ( t ) = c 1 + a e − b t , to the data. b. Estimate the limiting value of the function. At most, how many students will hear the rumor? c. Graph the function. d. Find the rate of change, N ' ( t ) . e. Find lim t → ∞ N ' ( t ) and explain its meaning.
Spread of a rumor. The rumor “People who study math all get scholarship” spreads across a college campus. Data in the following table show the number of students N who have heard the rumor after time t , in days. Time, t (in days) Number, N , Who Heard the Rumor 1 1 2 2 3 4 4 7 5 12 6 18 7 24 8 26 9 28 10 28 11 29 12 30 a. Use REGRESSION to fit a logistic equation, N ( t ) = c 1 + a e − b t , to the data. b. Estimate the limiting value of the function. At most, how many students will hear the rumor? c. Graph the function. d. Find the rate of change, N ' ( t ) . e. Find lim t → ∞ N ' ( t ) and explain its meaning.
Solution Summary: The author explains how to calculate the logistic equation for the provided data using TI-83 calculator.
Spread of a rumor. The rumor “People who study math all get scholarship” spreads across a college campus. Data in the following table show the number of students N who have heard the rumor after time t, in days.
Time, t (in days)
Number, N, Who Heard the Rumor
1
1
2
2
3
4
4
7
5
12
6
18
7
24
8
26
9
28
10
28
11
29
12
30
a. Use REGRESSION to fit a logistic equation,
N
(
t
)
=
c
1
+
a
e
−
b
t
,
to the data.
b. Estimate the limiting value of the function. At most, how many students will hear the rumor?
c. Graph the function.
d. Find the rate of change,
N
'
(
t
)
.
e. Find
lim
t
→
∞
N
'
(
t
)
and explain its meaning.
j)
f) lim
x+x ex
g) lim Inx
h) lim x-5
i) lim arctan x
x700
lim arctanx
811x
4. Evaluate the following integrals. Show your work.
a)
-x
b) f₁²x²/2 + x² dx
c) fe³xdx
d) [2 cos(5x) dx
e) √
35x6
3+5x7
dx
3
g) reve
√ dt
h) fx (x-5) 10 dx
dt
1+12
University Calculus: Early Transcendentals (4th Edition)
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