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When sampling is from a population with mean 53 and standard deviation 10, using a sample of size 400, what are the expected value and the standard deviation of the sample mean?
Suppose that the lives of all such bulbs have a normal distribution with a mean of 750 hours and a standard deviation of 55 hours. Let x (sample mean) be the mean life of range sample of 25 such bulbs.
Parole board is examing five prisoners up for parole. let x= number of prisoners out of 5 on parole who become offenders. Find the probability distribution for x.
The probability Mary will receive an A in a class is 0.70. Assuming independence, if she is taking 5 classes this semester, calculate the probability she will receive exactly 3 A's.
He assigns a B to students who score between 1 and 2 standard deviations above the mean and a D to students who score 1and 2 standard deviations below the mean. All other students get a C. What percent of the class receives each grade assuming the..
Fourth-graders composing music. The Orff xylophone is often used in teaching music to children because it has removable bars that allow the teacher to present different options to the students.
find the region variable in the sampledataset. using sampledataset create a frequency distribution or a histogram.
you want to rent an unfurnished one-bedroom apartment in boston next year. the mean monthly rent for a random sample of
Write a short paper on the creation and effects of the Cotton Gin. Everything that is referenced or compared must be before 1875.
a chess tournament has 10 competitors of which 3 are russian 5 are french and 2 are english. if the tournament result
past experience has shown that on the average only 1 in 10 wells drilled hits oil. let x be the number of drillings
we break a stick at a uniformly chosen random location. find the probability that the shorter piece is less than 15th
the standard deviation is defined to be the square root of the variance.1 explain why it is conventional to take the
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