1. Find the variance, given _ x = 300, _ x? = 12,300, and n = 85. Ans Find the standard deviation for the following samples. 2. The fluctuations of prices of gasoline in a year time are as follows: P 38.85, 39.40, 40.05, 40.75, 40.25, 41.10. 41.85, 42.30, 41.30, 41.95, 42. 15, 42. 65 Ans 3. Data may not all be positive as illustrated by this example. A sample of eight corporations showed the following percentage changes in earnings per share in the current year compared with the previous year. 14.6%, 25.5%, 43.6%, -19.8%, -13.8%, 12.0%, 36.3%, 14.3% Ans 4. Data need not all be positive. Over a 7-year period, the annual percentage returns on common stocks were 5.1%, 14.3%, 19.0%, -14.7%, -26.5%, 37.2%, 23.8% Ans 5. The production of corn per acre can be characterize by the following frequency distribution: Yield per Acre (bu) 80-89 90-99 NAWNS 100-109 110-119 120-129 Ans