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The life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard deviation of 600 hours. a. What is the probability that a laser fails before 500 hours? b. What is the life in hours that 95% of the lasers exceed? c. If three lasers are used in a product and they are assumed to fail independently, what is the probability that all three are still operating after 7000 hours?
Please walk me all the steps.
Determine whether descriptive or inferential statistics have been used in the statement below:
SAT verbal scores are normally distributed with a mean of 401 and a standard deviation of 91. Use the Empirical Rule to determine what percent of the scores lie between 310 and 492.
A survey of the residents of a new subdivision on why they happened to select that area in which to live. You also wish to secure some information about what they like and do not like about life in the subdivision.
An article in Annals of Mathematical Statistics reports the following data on the number of borers in each of 120 groups of borers. Does the Poisson pmf provide a plausible model for the distribution of the number of borers in a group?
at year-end 2013 wallace landscapings total assets were 2.17 million and its accounts payable were 560000. sales
Suppose that the probability distribution of a random variable x can be described by the formula. Calculate the variance and standard deviation.
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The opportunity to apply ethical theories to the complex issue of ageism
20 students in a class - if there is a 15% probability that a randomly chosen member has seen a particular movie - what is the expected number of students have seen the movie?
Derive an expression for the closed loop transfer function: Because the output is related to the actuating signal by G(s), we have
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