As compared to the short-run supply curve, what should the long-run supply curve look like?

Suppose you were told that scores on an examination were converted to standard scores with a mean = 500, range of 800, and a standard deviation of 100. A person with a score of 600 has performed better than what percent of the persons taking the test?

Variable X is distributed normally and has a mean of 10. If the probability that an observation of X will be negative is 0.16, what is the coefficient of variation of X?

The last day that the buyer of the share will receive the dividend is:

A portfolio earned the following rates of return over a period of twelve months.

What is the portfolio's co-efficient of variation?