# Normal Distribution probability word problem

I am revising for my assignment on Normal Distribution but I do not understand my lecture note.

An IQ test is applied to a population of adults. The scores, X, on the test are found to be normally distributed with. Adults scoring more than 140 on the test are classified as ‘genius’. The mean is 100 and standard deviation is 15.

X~N(100,15^2)

The probability that an adult chosen at random achieves a ‘genius’ classification is 0.00383. I dont understand how we get to that answer. Please can someone explain this to me?

Thank you very much