Consider a sample with a mean of and a standard deviation of . What are the z
Question:
Consider a sample with a mean of and a standard deviation of . What are the z-scores for the following data values: , , , , and ? Round your answers to 2 decimal places and enter negative values as negative numbers, if necessary. If your answer is zero, enter “0”.
Data Value | -score |
520 | |
655 | |
510 | |
450 | |
285 |
Suppose the data have a bell-shaped distribution with a mean of and a standard deviation of . Use the empirical rule to determine the percentage of data within of the following range:
22 to 38 | - Select your answer -Approximately 68%Approximately 75%Approximately 89%Approximately 94%Approximately 95%Almost allItem 1 |
18 to 42 | - Select your answer -Approximately 68%Approximately 75%Approximately 89%Approximately 94%Approximately 95%Almost allItem 2 |
26 to 34 | - Select your answer -Approximately 68%Approximately 75%Approximately 89%Approximately 94%Approximately 95%Almost allItem 3 |
The Energy Information Administration reported that the mean retail price per gallon of regular grade gasoline was . Suppose that the standard deviation was and that the retail price per gallon has a bell-shaped distribution. NOTE: Please use empirical rule approximations for this problem. a. What percentage of regular grade gasoline sold between $3.30 and $3.70 per gallon (to 1 decimal)?
b. What percentage of regular grade gasoline sold between $3.30 and $3.60 per gallon (to 1 decimal)?
c. What percentage of regular grade gasoline sold for less than $3.70 per gallon (to 1 decimal)? |
Discovering Advanced Algebra An Investigative Approach
ISBN: 978-1559539845
1st edition
Authors: Jerald Murdock, Ellen Kamischke, Eric Kamischke