1. The annual incomes of the five vice presidents of LBDI are $125,000; $128,000; $122,000; $133,000; and $140,000. Consider this a population. a. What is the range? b. What is the arithmetic mean income? c. What is the population variance? The standard deviation? d. The annual incomes of vice presidents of other banks similar to LBDI were also studied. The mean was $129,000, and the standard deviation was $8,612. Compare the means and dispersions in the two firms
2. The annual incomes of a sample of middle-management employees at Ecobank are $62,900, $69,100, $58,300, and $76,800. (a) Find the sample mean. (b) Is the mean you computed in (a) a statistic or a parameter? Why? (c) What is your best estimate of the population mean?

1. A fast food center is concerned about credit card debt. A survey of 10 young adults with credit card debt of more than $2,000 showed they paid an average of just over $100 per month against their balances. Listed below are the amounts each young adult paid last month.

$110

$126

$103

$93

$99

$113

$87

$101

$109

$100

1. Compute the sample variance.
2. Determine the sample standard deviation