# For a bell curve with mean 7 and standard deviation 3, how much area is under the curve, above the horizontal?

$A r e a = 1 {\text{ unit}}^{2}$
Given: Bell curve with mean $= \mu = 7$ and standard deviation $= \sigma = 3$.
A bell shape curve has a normal distribution. The peak of the curve is at the mean. The total area under this curve, above the horizontal or $x -$axis is always $1 {\text{ unit}}^{2}$.
If you wanted to find the area at a certain location $x$ along the horizontal, you would find the z-score using the formula $z = \frac{x - \mu}{\sigma}$, look up the z-score value in a z-table and find the area from the start of the curve up to that $x$ value.