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(1-pJ
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b.
Find
the
mean
and
standard
deviation.
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=
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f
l
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A
r\'
I"('
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_(:\
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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
p-opor
Non
ofF
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sl
oy
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