Question

The cholesterol levels of an adult can be described by a normal model with a mean of 186 ​mg/dL and a standard deviation of 28.

Answer 1

$P(X>200)= 1-P(X≤200)\\ P(X>200)= 1-P(Z≤\frac{200-186}{28})\\ P(X>200)= 1-P(Z≤0.5)\\ P(X>200)= 0.31$