Intraday price change for ACHN is about $0.23 from the day's low to the day's high.
The previous business day's price range from the open of $4.83 is expected to range from a low of $4.72 to a high of $4.95.
Price moves beyond this range are outside the average.
The previous business day's closing price may be between $4.84 and $4.82 assuming average price movements.
Note that events including news, ACHN earnings, or broad market swings will unexpectedly affect price.
Closing prices outside of this range indicate a move outside the average closing price movement.