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The length of time (in seconds) that a user views a page on a Web site before moving to another page is a lognormal random variable with parameters mean= 0.5 and variance (w^2)= 1
(a) What is the probability that a page is viewed for more than 10 seconds?(b) What is the length of time that 50% of users view the page?(c) What is the mean and standard deviation of the time until a user moves from the page?
suppose that 12 observations are drawn from a normal population. the observations are 15 912 11 8 12 11 7 15 9 6 and
A manufacturer claims that the life span of its tires is 52,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of the tires are normally distributed.
Linear Optimization.
If a male passenger is randomly selected, find the probability that he can fit through the doorway withouth bending.
A Geiger-Muller tube and a scaler record approximately 50 counts per second due to a radioactive source. What is the shortest counting time required so that the percentage error of the counts will not exceed 1%?
Suppose that it is important to demonstrate that the wall thickness exceeds 4.0 mm. Test appropriate hypotheses using these data. Draw conclusions at α= 0.05.
Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is approximately normal. Find P90.
What is the critical F value for a sample of 21 observations in the numerator and 15 in the denominator? Use a two-tailed test and the 0.02 significance level. (Round your answer to 2 decimal places.)
the time in minutes it takes to install a certain software package is a continuous variable with the density.fx 4x3 if
Assume that the following four examines were tested as part of a large group that had a normally curved distribution.
question it is known that the number of business failure in usa per hour is distributed as poisson with mean micro
computing the probability values using normal distribution.laboratory rats commit an average of micro 40 errors before
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