Question: The table below summarizes monthly sales by a retailer of a product over a 10 year period and the percentage of months that number of units was sold.

Units Sold Percentage

Suppose the retailer pays the product’s manufacturer $150 per unit of the product and sells the product for $275 per unit. Suppose further that the retailer’s monthly order for the product is equal to the mean number of units sold. How many units of this product must the retailer sell to break even? Also, find the variance and standard deviation of the number of units sold.