The paired data below consist of the costs of advertising (in thousands of dollars) and the numberof products sold (in thousands):

Cost: 9 2 3 4 2 5 9 10 Number 85 52 55 68 67 86 83 73

Assuming a significant linear correlation exists between the above variables, use regression line to predict number of products (in thousands) sold given an advertising cost of $7500.

Select one:

a. 449.19b. 76.72

c. 79.52

d. 78.09

e. 421.29