**1. How do you know when to use a continuity correction?**

If the wording of the problem indicates some rounding, say, to the nearest whole number or if the values of the variable are discrete i.e. whole numbers, then a continuity correction may be needed.

**2. Why should I draw a diagram when doing normal distribution problems?**

Many people find it easier to visualise the region involved when finding the probabilities, if they have a diagram.

"A picture is worth 1000 words" as they say!