Question

The toasters produced by a company have a normally distributed life span with a mean of 5.8 years and a standard deviation of 0.9 years, what warranty should be provided so that the company is replacing at most 3% of their toasters sold?

Answer #1

The life span of a battery is normally distributed, with a mean
of 2400 hours and a standard deviation of 50 hours. What percent of
batteries have a life span that is more than 2460 hours? Would it
be unusual for a battery to have a life span that is more than 2460
hours? Explain your reasoning.
What percent of batteries have a life span that is more than
2460 hours?
Approximately_______% of batteries have a life span that is...

13)Your company manufactures hot water heaters. The life spans
of your product are known to be normally distributed with a mean of
13 years and a standard deviation of 1.5 years.
What is the probability that the mean life span in a group of 10
randomly selected hot water heaters is between 12 and 15 years?
(Round to the nearest ten-thousandth.)
14) Your company manufactures hot water heaters. The life spans
of your product are known to be normally distributed...

The shelf life of a battery produced by one major company is
known to be Normally distributed, with a mean life of 8 years and a
standard deviation of 0.9 years. What value of shelf life do 16% of
the battery shelf lives fall above? Round your answer to one
decimal place.
Answer: years

Company XYZ know that replacement times for the DVD players it
produces are normally distributed with a mean of 5.8 years and a
standard deviation of 0.9 years.
Find the probability that a randomly selected DVD player will have
a replacement time less than 4 years?
P(X < 4 years) =
Enter your answer accurate to 4 decimal places. Answers obtained
using exact z-scores or z-scores rounded to 3
decimal places are accepted.
If the company wants to provide a...

A company manufactures light bulbs. The company wants the bulbs
to have a mean life span of 999 hours. This average is maintained
by periodically testing random samples of 25 light bulbs. If the
t-value falls between minus−t 0.95 and t 0.95 then the company will
be satisfied that it is manufacturing acceptable light bulbs. For a
random sample, the mean life span of the sample is 1006 hours and
the standard deviation is 22 hours. Assume that life spans...

A company manufactures light bulbs. The company wants the bulbs
to have a mean life span of 990 hours. This average is maintained
by periodically testing random samples of 16 light bulbs. If the
t-value falls between minus t 0.99 and t 0.99, then the company
will be satisfied that it is manufacturing acceptable light bulbs.
For a random sample, the mean life span of the sample is 1007
hours and the standard deviation is 28 hours. Assume that life...

A company manufactures light bulbs. The company wants the bulbs
to have a mean life span of
999999
hours. This average is maintained by periodically testing random
samples of
2525
light bulbs. If the t-value falls between
minus−t 0.95t0.95
and
t 0.95t0.95,
then the company will be satisfied that it is manufacturing
acceptable light bulbs. For a random sample, the mean life span of
the sample is
10061006
hours and the standard deviation is
2222
hours. Assume that life spans...

A company knows that replacement times for the quartz time
pieces it produces are Normally distributed with a mean of 12.8
years and a standard deviation of 2.2 years.
Find the proportion of a randomly selected quartz time pieces that
will have a replacement time less than 5.8 years?
P(X < 5.8 years) =
Enter your answer accurate to 4 decimal places. Answers obtained
using exact z-scores or z-scores rounded to 3
decimal places are accepted.
If the company wants...

The life spans of batteries are normally distributed, with a
mean of 2000 hours and a standard deviation of 30 hours.
a. How would we know by looking at the graph, if the probability
of batteries with a life span of less 1900 hours is more or less
than 50%> Explain your answer. DO NOT show any
mathematical work.
b. What percent of batteries have a life span that is more than
2065 hours? Show work as in class.

The shelf life of a battery produced by one major company is
known to be Normally distributed, with a mean life of 7 years and a
standard deviation of 1 years. What value of shelf life do 16% of
the battery shelf lives fall above? Round your answer to one
decimal place.
_____ years?

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