Question

Electricity bills in a certain city have mean $ 120.15 . Assume the bills are normally distributed with standard deviation $ 17.01 . A sample of 54 bills was selected for an audit. Find the 61 percentile for the sample mean.

Write only a number as your answer. Round to two decimal places (for example: 42.81). Do not write any units.

Answer #1

Electricity bills in a certain city have mean $87.57. Assume the
bills are normally distributed with standard deviation $14.97. A
sample of 80 bills was selected for an adult. Find the 53
percentile for the sample mean. Write only a number as your answer.
Round to two decimal places (for example: 42.81). Do not write any
units.

Electricity bills in a certain city have mean $ 84.26 . Assume
the bills are normally distributed with standard deviation $ 16.60
. Find the value that separates the lower 63 % of the bills from
the rest. Write only a number as your answer. Round to two decimal
places (for example: 42.81). Do not write any units.

Natural Gas bills in a certain city have mean $80.86. Assume the
bills are normally distributed with standard deviation $14.71. Find
the value that separates the lower 70% of the bills from the
rest.
Write only a number as your answer. Round to two decimal places.
Do not write any units.

Question 7
The mean monthly rent for a one-bedroom apartment without a
doorman in Manhattan is $ 2,642 . Assume the standard deviation is
$500. A real estate firm samples 100 apartments. What is the
probability that the average rent of the sample is more than $
2,710 ?
Write only a number as your answer. Round to 4 decimal places
(for example 0.1048). Do not write as a percentage.
Question 8
A survey among freshmen at a certain university...

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...

The weights of broilers (commercially raised chickens ) are
approximately normally distributed with mean 1387 grams and
standard deviation 161 grams . What is the probability that a
randomly selected broiler weighs more than 1,532 grams ? Write only
a number as your answer Round to 4 decimal places ( for example
0.0048 ). Do not write as a percentage .
The weights of broilers (commercially raised chickens) are
approximately normally distributed with mean 1387 grams and
standard deviation 161...

17) In a certain city, the household electricity bills are
approximately normally distributed with a mean of $150 and a
standard deviation of $25. A researcher took random samples of 25
electricity bills for a certain study.
a. Based on this information, what is the expected value of the
mean of the sampling distribution of mean?
b. What is the standard error of the sampling distribution of
mean?
c. If his one sample of 25 bills has an average cost...

Question 1 (1
point)
Suppose that a sample of size 60 is drawn from a population with
mean 88 and standard deviation 61 . Find the value of , the mean of
the distribution of sample means.
Wrtie only a number as your answer.
Your Answer:
Question 2 (1
point)
Suppose that a sample of size 68 is drawn from a population with
mean 64 and standard deviation 46 . Find the value of , the
standard deviation of the...

4. The amount of electricity bills for all households in a city
have a skewed probability distribution with a mean of $145 and a
standard deviation of $30. Find the probability that the mean
amount of electric bills for a random sample of 71 households
selected from the city will be
a. between $131.5 and $136.25.
b. more than population mean by at least $4.5

4. The amount of electricity bills for all households in a city
have a skewed probability distribution with a mean of $145 and a
standard deviation of $30. Find the probability that the mean
amount of electric bills for a random sample of 71 households
selected from the city will be
a. between $131.5 and $136.25.
b. more than population mean by at least $4.5

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 9 minutes ago

asked 15 minutes ago

asked 22 minutes ago

asked 55 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago