ut the exact value, but I <em>am</em> pretty sure about the general range into which each value will fall.</p>
    <p>Let's redo the calculation with ranges:</p>
    <p><code>1400~1700 * 0.55~0.65 - 600~700 - 100~200 - 30 - 20 = -60~220</code></p>
    <p>Now, I am 95% sure the real value of each item falls into the range. That means I am also 95% sure the real balance will fall into the -$60 to +$220 range. This is much more helpful than the one number before. For one thing, I now know that we could very we