Math Solutions

[Solution] The IQ scores of a certain population follows the normal curve. Suppose that the average IQ was 104 with a standard deviation $20. What is the

Question: The IQ scores of a certain population follows the normal curve. Suppose that the average IQ was 104 with a standard deviation $20.

  1. What is the chance, in percent, that a randomly chosen person has score less than or equal to 79?
  2. What is the chance, in percent, that a randomly chosen person has score at least 79 ?
  3. If a person's IQ is better than or equal to $69.15$ percent of the all students who took the test, estimate his score.

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