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A computer system uses passwords constructed from the 26 letters (a to z) or 10 integers (0 to 9). Suppose there are 10000 users on the system with unique passwords. A hacker randomly selects (with replacement) passwords from the potential set.
A) There are 9900 users with unique 6 character passwords on the system and the hacker randomly selects 6 character passwords. What is the mean and standard deviation of the number of attempts before the hacker selects a user password?
B) Suppose there are 100 users with unique 3 character passwords on the system and the hacker randomly selects 3 character passwords. What is the mean and standard deviation of the number of attempts before the hacker selects a user password?
C) Which system is more secure the 6 character or the 3 character password protected system?
The National Highway Association is studying the relationship between the number of bidders on a highway project and the winning (lowest) bid for the project.
At the .05 significance level, can we conclude that the guideline is still reasonable?
The diameters of ball bearings are distributed normally. The mean diameter is 74 millimeters and the variance is 16. Find the probability that the diameter of a selected bearing is less than 78 millimeters.
Sample of size 26 was taken from normal population with standard deviation 1.697. Approximate the probability that standard deviation of sample is greater than 1.23.
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
The contingency table below shows the results of a random sample of 200 state representatives that was conducted to see whether their opinions on a bill are related to their party affiliation
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated?
A laboratory tested 70 chicken eggs and found that the mean amount of cholesterol was 229 milligrams with s = 19.9 milligrams. Construct a 95% confidence interval for the true mean cholesterol content of all such eggs.
Discuss how you would investigate the operations of the plant to determine why the proportions were off the targeted values. Speculate on three or more possible conditions in plant and bagging process that could have caused the observed results.
Tourism is one consideration for CoffeeTime's future, A survey of 1,233 visitors to mumbai last year revealed that 110 visited a small cafe during their visit.
Illustrate out the term control chart? Critically discuss the grand mean, the UCL and the LCL of a control chart for the mean?
The average height of american woman is distributed normally, with a mean of 63.5 inches and a standard deviation 2.5 inches. Approximately what percentage of american women are taller than 58.5 inches,
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