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There are two fuses in an electrical device. Let X denote the life time of the first fuse and Y denote the life time of the second fuse (both in years). Assume that the joint probability density function of X and Y is given by
i) Findii) Find the probability that both fuses last at least 3 years.iii) Find the marginal probability density function of X.iv) Find the marginal probability density function of Y.
Find out the crude death rate, age specific death rate, standard death rate and adjusted death rate.
The mean starting salary for college graduates in the spring of 2000 was$31,280. Assume that the distribution of starting salaries follows the normal distribution with a standard deviation of 3,330.
Elizabeth Bailey is the owner and general manager of Princess Brides, which provides a wedding planning service in Southwest Louisiana.
A multiple-choice examination consists of 90 questions, each having possible choices a, b, c, d, and e. Approximate the probability that a student will get at least 21 answers correct if she randomly guesses at each answer.
Estimate the area under the Normal Distribution from the mean to a z-score of -2.07. Estimate the z-score that corresponds to an area of 0.5557 under the Normal Distribution.
Given that the mean of 100 observations is 42.5 and that their standard deviation is 6.313, find the sum of the squares of the observations.
The Department of Labor wants to estimate the percentage of females in the U.S. labor force to within ±5%, with 90% confidence. How many employment records should be sampled?
Describe the following correlation. The students with the highest grades in written French were also the students with the highest grade in spoken French.
Identify whether the following variables are numerical or categorical if numerical state whether the variable is discrete or continuous. if categorical state, whether the variable is nominal or ordinal.
Create a 99 percent confidence interval for difference in means between Line B and Line C.
Hypothesis test for one population mean - What is the alternative hypothesis and What is the null hypothesis?
Use Excel and determine the number of each type of person that will be needed to complete the job within the allotted time and at minimum cost.
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