Ask Your Teacher The "random walk" theory of securities prices holds that price movement is disjoint time periods which independent of each other. Suppose that we only record whether the price is up and down per year. The probability that our portfolio rises in price in any one year is 0.65. Give all answers with 2 decimal places.

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average