What is the beta of a stock whose covariance with the market portfolio return is 0.0045 if

Question:

What is the beta of a stock whose covariance with the market portfolio return is 0.0045 if the variance of the return on the market portfolio is 0.002?

Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...