Intraday price change for ACHN is about $0.21 from the day's low to the day's high.
The previous business day's price range from the open of $3.70 is expected to range from a low of $3.60 to a high of $3.81.
Price moves beyond this range are outside the average.
The previous business day's closing price may be between $3.70 and $3.70 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.