Question

The lifetime of a certain type of battery is normally distributed with mean value 11 hours and standard deviation 1 hour. There are nine batteries in a package. What lifetime value is such that the total lifetime of all batteries in a package exceeds that value for only 5% of all packages? (Round your answer to two decimal places.)

hours

Answer #1

The lifetime of a certain type of battery is normally
distributed with mean value 11 hours and standard deviation 1 hour.
There are four batteries in a package. What lifetime value is such
that the total lifetime of all batteries in a package exceeds that
value for only 5% of all packages? (Round your answer to two
decimal places.)

The lifetime of a certain type of battery is normally
distributed with mean value 13 hours and standard deviation 1 hour.
There are nine batteries in a package. What lifetime value is such
that the total lifetime of all batteries in a package exceeds that
value for only 5% of all packages? (Round your answer to two
decimal places.)
hours

The lifetime of a certain type of battery is known to be
normally distributed with a population standard deviation of 20
hours. A sample of 50 batteries had a mean lifetime of 120.1
hours.
a. What is the point estimate?
b. Calculate the sampling error.
c. Construct a 95% confidence interval for the population mean.
Explain the answer in a sentence.

The lifetime of a certain type of battery is normally
distributed with a mean of 1000 hours and a standard deviation of
100 hours. Find the probability that a randomly selected battery
will last between 950 and 1050 hours

When used in a particular DVD player, the lifetime of a certain
brand of battery is normally distributed with a mean value of 12
hours and a standard deviation of 0.8 hours. Suppose that two new
batteries are independently selected and put into the player. The
player ceases to function as soon as one of the batteries fails.
(Use a table or technology.)
(a) What is the probability that the DVD player functions for at
least 10 hours? (Round your...

1.) The lifetime of a certain type of automobile tire (in
thousands of miles) is normally distributed with mean 42 and
standard deviation 8. Find the percentile corresponding to p = 36%
of the tire lifetimes.
Write only a number as your answer. Round to 2 decimal
places.
2.) Electricity bills in a certain city have mean $98.09. Assume
bills are normally distributed with standard deviation $17.94. Find
the value that seperates the lower 40% of the bills from the...

A battery for the capsule in a space ﬂight has a lifetime, X,
that is normally distributed with a mean of 100 hours and a
standard deviation of 30 hours.
(a) What is the distribution of the total lifetime T of three
batteries used consecutively, T = X1 + X2 + X3 ,if the lifetimes
are independently distributed?
(b) What is the probability that three batteries will suﬃce for
a mission of 200 hours?
(c) Suppose the length of the...

Lifetimes of batteries in a certain application are normally
distributed with mean 53 hours and standard deviation 6 hours. What
is the lifetime corresponding to a standard unit of “–1.60”?

It is known that the lifetime of a certain type of light bulb is
normally distributed with
a mean lifetime of 1,060 hours and a standard deviation of 125
hours. What is the
probability that a randomly selected light bulb will last
between 1,000 and 1,100 hours?

The lifetime of a certain brand of battery is known to have a
standard deviation of 16 hours. Suppose that a random sample of 50
such batteries has a mean lifetime of 37.6 hours. Based on this
sample, find a 90% confidence interval for the true mean lifetime
of all batteries of this brand. Then complete the table below.
Carry your intermediate computations to at least three decimal
places. Round your answers to one decimal place. ( If necessary,
consult...

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