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A student earned a score of 940 on a national achievement test. The mean test score was 850 with a standard deviation of 100. What proportion of students had a higher score than the student with the score than the student with the score of 940? (Assume that the test scores are normally distributed.)
Exercise and adequate sleep. A survey of 656 boys and girls who were 13 to 18 years old asked about adequate sleep and other health-related behaviors.
A statistical analysis of 1,000 long-distance calls made from the headquarters of the Bricks and Clicks Computer Corporation indicates that the length of these calls is normally distributed with μ = 240 seconds and σ = 40 seconds.
A multiple choice test with 50 questions is given. Each question has four choices. What is the student's probability of passing if passing is at least 60% correct?
Grindit & Floggit Ltd. make customized Widgets at a cost of $150 per unit of which 3% (on average) happen to be out of tolerance. Up to 115 Widgets can be produces in one continuous run whose set up incurs an additional cost of $10 000.
Show that theta~ = u(X) is an unbiased estimator of theta, where u(0) = 1 and u(x) = 0 if x =1,2, ... Compare the MSEs of theta(hat) and theta~ for estimating theta = e^(-m) when m=1 and m=2
Test for the existence of a nonzero linear correlation in the "population" of prices of the two stocks. For your sample, use as many daily prices as you can.
You are given a member function of a random process as where the amplitude is in volts. Construct a histogram of y(t).
the daily news reported that the color distribution for plain mampms was 35 brown 20 yellow 20 orange 15 green and 10
What is the (population) mean annual return for a portfolio consisting of 50% Biotechnology Fund, 30% Information Services Fund, and 20%
Must you assume that the population amount of paint per can is normally distributed here? Explain
What percent of the class is male?- What percent of the class considers themselves to be "Conservative"?- What percent of the males in the class consider themselves to be "Conservative"?
For the following frequency distribution:
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