Question
8
1/
1
point
The
average
lifetime
of
a
certain
new
cell
phone
is
three
years.
The
manufacturer
will
replace
any
cell
phone
failing
within
two
years
of
the
date
of
purchase.
The
lifetime
of
these
cell
phones
is
known
to
follow
an
exponential
distribution.
The
decay
rate
is:
0.1666
0.6666
e
0.3333
0.5000
w
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8
feedback
1/3
=.3333
Question
9
1/
1
point
Suppose
that
the
longevity
of
a
light
bulb
is
exponential
with
a
mean
lifetime
of
eight
years.
Seventy
percent
of
all
light
bulbs
last
at
least
how
long?
0.1175
0.1859
ve
9.6318
0.3034
0.3682
