The IQ of randomly selected individuals is often assumed to follow a normal distribution with the mean of 100 and the standard deviation of 15. Find the probability that a randomly selected individual has an IQ: Above 140 Between 120 and 130 Find the value of X such that 99% of the population has IQ at least X.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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The IQ of randomly selected individuals is often assumed to follow a normal distribution with the mean of 100 and the standard deviation of 15. Find the probability that a randomly selected individual has an IQ:

  1. Above 140
  2. Between 120 and 130
  3. Find the value of X such that 99% of the population has IQ at least X.
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