Activity 3 Access the dataset Sales and Costs.xlsx (See the attached) and answer the following questions. a. Calculate these descriptive statistics: b. Mean of sales: $1,483,403.68 c. Variance of materials costs: $306,713,022,065.12 d. Covariance of labor costs and materials costs: $3,178,945.61 e. Mean of labor costs: $72,410.42 f. Total sales: $357,500,286 Calculate at least two more descriptive statistics for this dataset. Total Labor Cost: $17,450,911.00 Mean of Material cost: $23,682.16