If the retailing industry is perfectly competitive and Wal-Mart opens five new stores, output must be such that:
A manufacturer of headache medicine claims it is 70 percent effective within a few minutes. That is, out of every 100 users 70 get relief within a few minutes. A group of 12 patients are given the medicine. If the claim is true, what is the probability that 8 have relief within a few minutes?
An automatic machine inserts mixed vegetables into a plastic bag. Past experience revealed that some packages were underweight and some were overweight, but most of them had satisfactory weight.
Weight % of Total Underweight 2.5 Satisfactory 90.0 Overweight 7.5
Three packages are selected from the food processing line. What is the probability of selecting and finding that all three of them are underweight?
A bell-shaped, symmetrical frequency distribution has a mean of 10. If 16% of the observations in the distribution are negative, what is the coefficient of variation of X?
A portfolio has two securities with 35% and 65% allocations by market value. The first security has a return of 8% and the second security has a return of 14%. What is the value-weighted average return for the portfolio?
