Electricity bills in a certain city have mean $ 122.92 . Assume the bills are normally distributed with standard deviation $ 19.02 . Find the value that separates the lower 50 % of the bills from the rest.
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Natural Gas bills in a certain city have mean $119.34. Assume the bills are normally distributed with standard deviation $13.23. Find the value that separates the lower 34% of the bills from the rest
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Question 9 (1 point) Saved Electricity bills in a certain city have mean $ 123.76. Assume the bills are normally distributed with standard deviation $ 18.20. A sample of 60 bills was selected for an audit. Find the 44 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. Your Answer: Answer
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The amounts of electricity bills for all households in a particular city have an approximately normal distribution with a mean of $145 and a standard deviation of $28. Let ū be the mean amount of electricity bills for a random sample of 20 households selected from this city. Find the mean and standard deviation of X. Round your answers to the nearest integer, if required. Mj = $ll Gü = $ Comment on the shape of the sampling distribution of...
The amounts of electricity bills for all households in a city have a skewed probability distribution with a mean of $145 and a standard deviation of $36. Find the probability that the mean amount of electric bills for a random sample of 75 households selected from this city will be between $137 and $150. Round your answer to four decimal places.
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th+logical+th Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in 2011 was $109.77. Assume the amounts are normally distributed with standard deviation $22.00. Use the TI-84 Plus calculator to answer the following (a) Find the 8th percentile of the bill amounts. (b) Find the 69th percentile of the bill amounts. (c) Find the median of the bill amounts. Round the answers to at least two decimal places Part 1 of...
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