Intraday price change for BIIB is about $5.04 from the day's low to the day's high.
The previous business day's price range from the open of $279.00 is expected to range from a low of $276.54 to a high of $281.58.
Price moves beyond this range are outside the average.
The previous business day's closing price may be between $279.12 and $278.88 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.