Arduino ultrasonic sensor project
If you don't know how many data points will be recorded, look into vectors or an external storage device. Alternatively you could use a circular array if you don't mind losing recorded data after a while.

If you know how many data points will be recorded, a basic array will suffice.

As for excluding invalid values:

// Keep trying to get a valid data point 
While (RangeInCentimeters &gt; 512 &amp;&amp; RangeInCentimeters &lt; 400)
{
 delay(200);  // The minimum value of this delay depends on the sample rate of your sensor
 RangeInCentimeters = ultrasonic.MeasureInCentimeters();
}

//... Store data to array/linked list/etc


I changed your max range to 512 because this is likely the max real value (2^9 = 512).