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According to Investment Digest ("Diversification and the Risk/Reward Relationship", winter 1994, 1-3), the mean of the annual return for common stocks from 1926 to 1992 was 15.4%, and the standard deviation of the annual return was 24.5%. During the same 67-year time span, the mean of the annual return for long-term government bonds was 5.5%, and the standard deviation was 6.0%. The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variables with the means and standard deviations given previously.
A. Find the probability that the return for common stocks will be greater than 8%.B. Find the probability that the return for common stocks will be greater than 20%.
Prove that there are no integers x, y, and z such that. Show that square root of 2 cubed is an irrational number.
In 1998, as the advertising campaign, Nabisco Company announceda "1000 Chips Challenge," claiming. Develop the 95% confidence interval for average number of chipsin bags of Chips Ahoy cookies.
Assuming that the Styrofoam absorbs a negligibly small amount of heat and that no heat was lost to the surroundings, what is the specific heat capacity of the metal?
Sugar packaged by a certain machine has a mean weight of 5lb and a standard deviation of 0.02 lb. For what values of c can the manufacturer of the machinery claim that the sugar packaged by this machine has a weight between 5 - c and 5 + c lb with..
Use differential to approximate square root of 16.3
If 20 voters are selected at random, and X is the number of voters which support this referendum, determine the mean and variance of X.
If the probability of getting caught copying someone else's exam is .1, find the probability of not getting caught in three attempts. Assume independence.
The same city are delivered within two days. Six parcels are randomly sent to different locations. What is the probability that all six arrive within two days?
Fred received the following scores for his gymnastics routine: 8.5, 7.8, 8.0, 6.8, 7.1, 7.6. To figure out his score, the judges drop the highest and lowest score and then average the rest of his scores.
An American Society of Investors Survey found that 30% of individuals have used a discount broker. In a random sample of 9 individuals, what is the probability That:
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
The pet-drug market is growing very rapidly. Before new pet drugs can be introduced into the market place, they must be approved by the U.S. Food and Drug Administration.
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