Intraday price change for BIIB is about $15.32 from the day's low to the day's high.
The previous business day's price range from the open of $329.56 is expected to range from a low of $317.57 to a high of $332.88.
Price moves beyond this range are outside the average.
The previous business day's closing price may be between $329.04 and $330.08 assuming average price movements.
Note that events including news, BIIB earnings, or broad market swings will unexpectedly affect price.
Closing prices outside of this range indicate a move outside the average closing price movement.