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Determine the mean and variance of the random variable.
f(x) = (64 / 21)( 1/4)x , x = 1,2,3
Round your answers to three decimal places (e.g. 98.765).
The mean is =
The variance is =
Given the recursively defined sequence a_1= 0, a_2= -30, and a_n=8a_n-1 -15a_n-2, use complete induction to prove that a_n=5*3^n - 3*5^n for all positive integers n.
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
1.a large study was done to compare two treatments for recurring ear infections in young children. a total of 150
messages arrive to a computer server according to a poisson distribution with a mean rate of 10 per hour. determine the
one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower. QUESTION: Is the class's complain about harsher grading justified? ( use a : 0..
Medium-sized college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your results.
Formulate a linear programming model for this problem.
Analyze these data and summarize your findings for managers. Explain how information can be used by decision makers. Assume that sales per customer are normally distributed.
a pair of fair six-sided dice are tossed independently of each other.a list the sample space of this experiment.b
1. the diameter of bearing shafts that are manufactured in your factory follow a normal distribution with a mean of 1
the director of the irs has been flooded with complaints from the ta payers that people must wait more than 45 minutes
You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?
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