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Scores on a marketing exam are known to be normally distributed with mean and standard deviation of 60 and 20.
a) Find the probability that a randomly selected student scores between 50 and 80.
b) Find the probability that a randomly selected student scores between 20 and 40.
c) The syllabus suggests that the top 15% of the students will get an A in the course. What is the minimum score required to get an A?
A random sample of 900 homeowners in Delaware County is taken in order to estimate the average amount of money spent by homeowners on landscaping this spring. It turns out that this group spent an average of $200 with a standard deviation of $..
What order quantity do you recommend that Mac order from the scanner manufacturer and how much more expensive is the next lowest cost option
The number of completed entries made per hour
1. suppose south korea can produce 100 computer chips with 10 hours of labor input and 50 bed linens with 6 hours of
How much of each product do you recommend be produced that you believe maximizes revenue? How much revenue would be made if they followed your recommendation?
Simple random sampling
1) The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered. Use exponential smoothing with a smoothing constant of .8 to forecast attendance for the eighth year. 75, 78, 75, 120, ..
Define a correlation coefficient
Let variable X represents the improvement in time for each assembly line worker. Let μ represents the average improvement in time for the population. Has the training improved the time required on the job? Please test the hypothesis use α=0.05 ..
Find the probability that 3 or 4 of the batches will be rejected in the next shift and find the expected number and the standard deviation of batches rejected.
Complete the analysis of variance. At a .05 level of significance, is there a significant difference between the treatments?
Test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment?
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