Question

1. A manufacturer of compact fluorescent light bulbs advertises that the distribution of the lifespans of these light bulbs is nearly normal with a mean of 9,000 hours and a standard deviation of 1,000 hours.

A. What is the probability that a randomly chosen light bulb lasts more than 10,500 hours?

B. what is the probability that the mean lifespan of 15 randomly chosen light bulbs is more than 10,500 hours?

c. could you estimate the probability from parts A and B if the lifespans of light bulbs had a skewed distribution? explain

Answer #1

2. A manufacturer of fluorescent light bulbs advertises that the
distribution of the lifespans of these bulbs is normal with a mean
of 9,000 hours and a standard deviation of 1,000 hours.
What is the probability that a randomly chosen light bulb lasts
more than 9500 hours?
Describe the distribution of the mean span of 15 light
bulbs.
What is the probability that the mean lifespan of 15 randomly
chosen light bulbs is more than 9500 hours?

The Inconvenient Light Company advertises that, on average, its
CFL (Compact Fluorescent Light) bulbs last more than 4600 hours. To
test this claim using a 2% significance level, a statistician plans
to take a random sample of 97 bulbs and measure the amount of time
until each bulb fails. The lifetimes of the 97 bulbs in the sample
had a mean of 4656 hours and a standard deviation of 490 hours. The
value of the test statistic for this sample...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W W incandescent bulb uses only 23.0 W W of
power. The compact bulb lasts 10000 hours, on the average, and
costs $ $ 11.00, whereas the incandescent bulb costs only $ $...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on the
average, and costs $12.00, whereas the incandescent bulb costs only
76.0 ¢, but lasts just 750...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on the average, and
costs $ 12.0 , whereas the incandescent bulb costs only 76.0 ¢, but
lasts...

Compact fluorescent bulbs are much more efficient at
producing light than are ordinary incandescent bulbs. They
initially cost much more, but last far longer and use much less
electricity. According to one study of these bulbs, a compact bulb
that produces as much light as a 100 W incandescent bulb uses only
23.0 W of power. The compact bulb lasts 1.00×104 hours, on the
average, and costs $ 12.0 , whereas the incandescent bulb costs
only 73.0 ¢, but lasts...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on the average, and
costs $ 12.0 , whereas the incandescent bulb costs only 76.0 ¢, but
lasts...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 WW incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on
average, and costs $ 12.0, whereas the incandescent bulb costs only
75.0 ¢, but lasts just 750...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on the average, and
costs $ 12.0 , whereas the incandescent bulb costs only 73.0 ¢, but
lasts...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 10000 hours, on the average, and
costs $ 11.00, whereas the incandescent bulb costs only $ 0.76, but
lasts just...

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