IQ Intelligence quotient

Intelligence quotient (IQ) is a standardized score used as the output of standardized intelligence psychological tests to quantify a person's intelligence with the rest of the population (respectively to a given group). Intelligence has an approximately normal distribution. Today, the most commonly used deviation score with a population average of 100 and a population standard deviation of 15. What is the probability that a randomly selected person from the population has an IQ of less than 85?

Correct result:

p =  0.1587


m=100 s=15  xN(m,s) p=N(x<85)  p=0.1587

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