1. If the standard deviation of sample is 5 and each measurement in the sample is multiplied by 2, the new value of standard deviation for the sample would be?
2. A department store manager has recorded the annual energy cost (in pesos0 of five basic top freezer models of refrigerators and the correspoding weekly energy cost: Sharp (PhP71); National (PhP81); Samsung (PhP79); White Westinghouse (PhP93); and Whirlpool (PhP76). Find the variance for data on weekly enery costs?
3. A department store manager has recorded the annual energy cost (in pesos0 of five basic top freezer models of refrigerators and the correspoding weekly energy cost: Sharp (PhP71); National (PhP81); Samsung (PhP79); White Westinghouse (PhP93); and Whirlpool (PhP76). Compute the standard deviationfor data weekly energy costs?

4.The semi-annual salaries of all employees working for a company has mean of PhP42,350 and a standard deviation of PhP3,820. The years of schooling for the same employees has a mean of 15 years and a standard deviation of 2 years. Find the coefficient of variation for the se5.mi-annual salaries of all employees working for a company?

5.The semi-annual salaries of all employees working for a company has mean of PhP42,350 and a standard deviation of PhP3,820. The years of schooling for the same employees has a mean of 15 years and a standard deviation of 2 years. Calculate the coefficient of variation for years of schooling of all employees working for a company?

6.The semi-annual salaries of all employees working for a company has mean of PhP42,350 and a standard deviation of PhP3,820. The years of schooling for the same employees has a mean of 15 years and a standard deviation of 2 years. Compare the coefficient of variation (CV) between the sets of data.