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Suppose that the distribution of weekly water usage for single-family homes in a particular city is mound shaped and approximately symmetric. The mean is 1400 gallons, and the standard deviation is 300 gallons.
a) What is the approximate value of the 16th?
b) What is the approximate value of the median?
c) What is the approximate value of the 84th?
Determine the probability that tire wears out before 70,000 miles?
A fair die is rolled nine times. What is the probability that an odd number (1,3 or 5) will occur less than 3 times?
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? What is the p-value?
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
Determine the probability that a randomly selected teacher earns more than $525 per week?
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
We assume that we have selected two independent random samples from populations having proportions p 1 and p 2 and that p-hat 1 = 800/1000 and p-hat 2 = 950/1000
Probability values based on normal distribution - old exit exam followed a normal distribution
Estimate the population means growth in 1 year for 14-year-old boys. Make a point estimate and an 80% confidence interval estimate.
Find out the probability that the return for common stocks will be more than 0%.
What does the coefficient of determination tell you about the variation in attendance and the variation in the number of exhibitors?
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