3.
(7
points)
According
to
Information
Please
Alimanac,
80%
of
adult
smokers
started
smoking
before
they
were
18
years
old.
Suppose
100
adult
smokers
are
randomly
selected.
a.
Whatis
the
shape
of
the
Tlstrlbutlon
of
the
binomial
probability
distribution?
np(1pJ

."
?
'
/
"
A
",I'
(':'0
'
:_—.
"

"'/

'
'o
"I
v
OO{
U
ST
U
B
S0l
oy
{
0]
A\
"
'
&
'
SO
o=
—'3[/
b.
Find
the
mean
and
standard
deviation.
__
~
o5
—
"
)
:}'

J
u
=
'r'i
P'

v
—
\l—'
)
!
o
P
f
l

"
A
r\'
I"('
L'.?
J'
_(:\
'
R
Use
the
normal
approximation
to
the
binomial
to
approximate
the
probability
that
at
least
80
of
them
i
started
smoking
before
they
were
18
years
old.
Round
answer
to
the
nearest
thousandth

'/'?7
4.
(5
points)
Draw
a
normal
curve
with
pxgggand
2y210.
Label
the
mean
and
the
inflection
points
Shade
in
the
area
to
the
right
of
@@#25.
Find
this
area
to
the
nearest
thousandth
and
give
two
interpretations
of
this
area.
qorm
=
.67
()
The
popor
Non
ofF
4
sl
oy
e
/"
—rg
F{'h
@C«
o;