A variable, W, is normally distributed with a mean of 12. 68% of its observations lie between 8 and 16. The coefficient of variation of W is ________.
Answer(s): D
For a normal distribution, 68% of the observations lie within one standard deviation of the mean. Hence, the standard deviation of X equals 12-8 = 4. The coefficient of variation is then equal to standard deviation/mean = 4/12 = 0.33.
If you buy an item and pay for it with 48 monthly payments of $75, beginning next month, what was the cash price today, if interest accrues at 13% per year, compounded monthly?
Answer(s): C
The cash price would be the present value of the payments made using the specified interest rate. On the BAII Plus, press 48 N, 13 divide 12 = I/Y, 75 PMT, 0 FV, CPT PV. On the HP12C, press 48 n, 13 ENTER 12 divide i, 75 PMT, 0 FV, PV. Note that the answer will be shown as a negative number. Make sure the BAII Plus has the P/Y value set to 1.
A histogram is best described as:
A histogram is best described as a visual representation of a frequency distribution.
Samples of the wires coming off the production line were tested for tensile strength. The statistical results (in PSI) were:Mean = 500Median = 500Mode = 500Standard deviation = 40Mean deviation = 32Quartile deviation = 25Range = 240Number is sample = 100The middle 95 percent of the wires tested between approximately what two values?
Answer(s): B
95% of the observations lie between plus and minus two standard deviations from the mean, so it is 500 +/- 2 (40).
Theta Corp.'s stock is expected to appreciate 6% per year. If no dividends are paid out over the next 5 year and the current stock price is $28, what's the expected price in 5 years?
The expected price in 5 years is 28*(1.06^5) = 37.5
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