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A physical ?tness test was given to a large number of college freshmen. In part of the test, each student was asked to run as far as he or she could in 10 minutes. The distance each student ran in miles was recorded and can be considered to be a random variable, say X. The data showed that the random variable X followed the log-normal distribution with μy = 0.35 and σy = 0.5, where Y = ln X. A student is considered physically ?t if he or she is able to run 1.5 miles in the time allowed. What percentage of the college freshmen would be considered physically ?t if we consider only this part of the test?
The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619, 626, and 633. Suppose that the student with the score of 533 drops the seminar and is replaced by a student with a score of 765.
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviation of 3.3 mph.
a weather forecaster predicts that the may rainfall in a local area will be between 1 and 7 inches but has no idea
You're given that the forecast for the current period of 70 turned out to be 6 units less than the actual demand. The forecast for the next period is 75.8.
a converging lens f 12.8 cm is located 30.3 cm to the left of a diverging lens f -5.4 cm. a postage stamp is placed
For the following scores, find the: A. Mean. B Median. C. Sum of squared deviation. D. Variance. E. Standard deviation.
According to a recent poll published in USA TODAY, roughly 54% of U.S. men and 33% of U.S. women believe in extraterrestial aliens. Of U.S. adults, roughly 48% are men and 52% are women.
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
For each of the two groups, boys and girls, choose the lowest age group as the baseline and calculate the odds ratio associated with each age group.
a two-stage clinical trial is planned for for testing h0 p0.10 versus ha pgt0.10 where p is the proportion of
What is the purpose of using correlation analysis? How might correlation analysis be used in business decisions or in strategy formulation and implementation?
suppose that 88 of college men and 82 of college women were employed last summer. a sample survey interviews
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