Run rate can be very crucial in the end stages of the tournament. That's why the analysts always say that a team should bat out the full 50 overs, even if they are chasing a very large target. Too many teams aim for the full 2 points and lose wickets chasing unrealistic targets. They should have concentrated more on improving their Net Run Rate.
Bangladesh requires another 257 runs in 37 overs and 8 wickets in hand Though the required run rate is climbing to 7 but if they keeps wickets in hand they would be able to chase it else they might just have to end up losing the final match of this World cup as they have played some amazing cricket.
Another wicket is gone and the score is BAN 84/3 (19.4). The required rate is going to high after each ball. So the score chased will be very tough to Bangladesh. Now need to see what come back will happen by Bangladesh.