Question
In: Statistics and Probability
It is estimated that 0.5% of the callers to the billing department of a local telephone...
It is estimated that 0.5% of the callers to the billing department of a local telephone company will receive a busy signal.
What is the probability that of today's 1350 callers at least 5 received a busy signal? Use the poisson approximation to the binomial. (Round the final answer to 4 decimal places.)
Probability
Solutions
orchestra answered 1 year agoRelated Solutions
It is estimated that 0.1% of the callers to the billing department of a local telephone...
It is estimated that 0.1% of the callers to the billing
department of a local telephone company will receive a busy signal.
What is the probability that of today's 1230 callers at least 5
received a busy signal? Use the poisson approximation to the
binomial.
statistics
1. a. "On hold" times for callers to a local cable television company are known to...
1. a. "On hold" times for callers to a local cable television
company are known to be normally distributed with a standard
deviation of 1.4 minutes. Find the average caller "on hold" time if
the company maintains that no more than 6% of callers wait more
than 5.6 minutes. (Give your answer correct to two decimal
places.)
b. Of all mortgage foreclosures in the United States, 45% are
caused by disability. People who are injured or ill cannot
work--they then...
The Plant department of the local telephone company purchased four special pole hole diggers eight years...
The Plant department of the local telephone company purchased
four special pole hole diggers eight years ago for $14,000 each.
They have been in constant use to the present time. Due to an
increased workload, it is considered that additional machines will
soon be required. Recently it was announced that an improved model
of the digger has been put on the market. The new machines have
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machines, but their cost...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone...
A telephone service representative believes that the proportion
of customers completely satisfied with their local telephone
service is different between the Midwest and the South. The
representative's belief is based on the results of a survey. The
survey included a random sample of 1120 midwestern residents and
1260 southern residents. 37% of the midwestern residents and 49% of
the southern residents reported that they were completely satisfied
with their local telephone service. Find the 80%
confidence interval for the difference...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone...
A telephone service
representative believes that the proportion of customers completely
satisfied with their local telephone service is different between
the Midwest and the West. The representative's belief is based on
the results of a survey. The survey included a random sample of 760
midwestern residents and 680 western residents. 37% of the
midwestern residents and 46% of the western residents reported that
they were completely satisfied with their local telephone service.
Find the 90% confidence interval for the difference...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone...
A telephone service representative believes that the proportion
of customers completely satisfied with their local telephone
service is different between the Midwest and the West. The
representative's belief is based on the results of a survey. The
survey included a random sample of 760 midwestern residents and 680
western residents. 37% of the midwestern residents and 46% of the
western residents reported that they were completely satisfied with
their local telephone service. Find the 90% confidence interval for
the difference...
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone...
A telephone service representative believes that the proportion
of customers completely satisfied with their local telephone
service is different between the West and the Northeast. The
representative's belief is based on the results of a survey. The
survey included a random sample of 12401240 western residents and
13001300 northeastern residents. 46%46% of the western residents
and 35%35% of the northeastern residents reported that they were
completely satisfied with their local telephone service. Find the
98%98% confidence interval for the difference...
The manager of a department store is thinking about establishing a new billing system for the...
The manager of a department store is thinking about establishing
a new billing system for the store's credit customers. She
determines that the new system will be cost effective only if the
mean monthly account is more than $170. A random sample of 400
monthly accounts is drawn for which the sample mean is $178. The
manager knows that the accounts are approximately normally
distributed with a standard deviation of $65.
Can the manager conclude from this that the new...
You have just been promoted to supervisor of a department that maintains records for billing. The...
You have just been promoted to supervisor of a department that
maintains records for billing. The mean number of records that was
made under the old supervisor was 27 within one hour with a
standard deviation of 8. This was adopted as the standard for the
population of entries. You need to make the case to your boss that
your changes have improved the number that can be entered in one
hour. You take a survey of 40 of your...
A local public-action group solicits donations by telephone. For a particular list of prospects it was...
A local public-action group solicits donations by telephone.
For a particular list of prospects it was estimated that for any
individual the probability was 0.04 of an immediate donation by
credit card, 0.21 of no immediate donation but a request for
further information through the mail, and 0.75 of no expression of
interest. Information is mailed to all people requesting it, and
it is estimated that 20% of these people will eventually donate.
An operator makes a sequence of calls,...
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