From five summaries to a forecast, tips and tables

A restaurant relates tables served ($x$) to tips earned in dollars ($y$). Only summaries are available:

$\bar{x} = 20, \quad \bar{y} = 60, \quad s_x = 5, \quad s_y = 20, \quad r = 0.5.$

Predict the tips on a shift serving $x = 25$ tables.