Population has a mean
A normal population has µ = 50 and = 8. A random sample of n = 4 scores from this population has a mean of 54. What is the z-score for this sample mean?
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Dr. Jones conducted a study examining the relation-ship between the quality of breakfast and academic performance for a sample of n 20 first- grade stu-dents. The quality of breakfast was determined by interviewing each child's parents, and academ
A vertical line is drawn through the normal distribution at z = 0.50, and separates distribution in two sections. What proportion of the distribution is in the larger section?
A 1st year physics student assumes the probability of a dart landing anywhere on a line (drawn on the ground) is uniformly distributed from the point 0 to the point 10 inches away. What is the probability of a dart landing between 5.6 and 5.75 inc
An economist measures the GDP of Western European cities of a certain size (in terms of population). The average GDP of Western European cities is $20,000,000.
This group of surgeons determines that standard deviation of morbidity rates is 1.5%. Moreover they suppose that the morbidity rates are normally distributed. Using such model, find out the probability that the morbidity rate is less than 5 %.
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