Normal distribution with a mean
Marks on a Chemistry test follow a normal distribution with a mean of 65 and a standard deviation of 12. Approximately what percentage of the students has scores below 50?
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Given the estimated relationship Y = 4 + 3.1X +e where the standard deviation of the coefficient on X is 2 and we have a sample of 17 observations, test whether the coefficient is significantly different from 0.
Explain the concept of the mole qualitatively, either using ananalogy, or explaining what a mole of a substance actually is, and why the amu mass of an atom of an element is the equivalent mass ingram of a mole of that same element.
You will often work with salts ofFe3+,Pb2+, and Al3+ in thelaboratory. (All are found in nature, and all are importanteconomically.) If you have a solution concentration of 0.10M, what is the order in which their hydroxides precipitate as aqu
Compute the weight percent sulfur that must be added to completely crosslink an alternating acrylonitrile-butadiene copolymer, assuming that four sulfur atoms participate in each crosslink.
Determine the pressure and temperature entering the nozzle at state 4. If the nozzle efficiency is 95%, determine the temperature and velocity exiting the nozzle at state 5.
The set of numbers chosen is all that is important. The order in which they were chosen is irrelevant.
An investor picks 3 stocks out of 10 recommended by his broker. Of these, six will show a profit in the next year. What is the porbability the investor will pick
We pick a number between 0 and 999, then a computer picks one at random from that range. Compute the probability at least two of our digits will match the computers number. ( Note: We include any leading zeros, so 017 and 057 have two matching dig
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