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Let the random variable X follow a normal distribution with µ = 40 and ? = 10. The probability is 0.95 that X is in the symmetric interval about the mean between which two numbers?
Formulate a linear programming model for this problem.
a simple random sample of 120 sat scores has a mean of 1540. assume that sat scores have a population standard
questions involve the random variable x with probability distribution given below. please show all
The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Use Chebyshev's theorem to answer the following questions.
A system is tested for 10,000 hours and experiences 2 failures. Its failure rate is believed to be Poisson distributed.
Critically discuss how you can apply the concept and method of interval estimation to help you solve some of the problems in a regularly accounting department. Give a few examples.
What is the optimal solution if the annual return for U.S. Oil changes from $3 to $8 per share (everything else stays the same)? What is the value of the total return?
1. suppose the average thread-life of a certain brand of tire is 42000 miles and that this mileage follows the
A standard deviation of 68. a score is considered outstanding if it is at least 420. what is the % of the scores would be outstanding?
The sample mean talk time was 315 minutes with a standard deviation of 24 minutes. Why can we say that the sampling distribution of x is approximately normal?
Perform a contingency analysis on the data to determine if there is any dependency between the number of level of education attained by the father and the size of his family.
what pattern would appear in a graph of a pearson correlation of r -0.80?a. points tightly clustered around a line
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