You are given the following information concerning three portfolios, the market portfolio, and the risk$-$free asset:

Assume that the correlation of returns on Portfolio $Y$ to returns on the market is $0\mathrm{.}78.$ What percentage of Portfolio Y$\text{'}$s return is driven

by the market?

Note: Enter your answer as a decimal not a percentage. Round your answer to $4$ decimal places.

Answer is complete but not entirely correct.