Answers IQ test

Question 18

image/svg+xml 8 56 -48 104 -152 256 -408 ?
What is the next number in this sequence?

Explanation

The next number in the series is always found by subtracting the previous number from the number before it. So you calculate the number at position 3 by subtracting the number at position 2 from the number at position 1

Watch out, subtracting a negative number is the same as adding the number.
8 - 56 = -48
56 - -48 = 104
-48 - 104 = -152
104 - -152 = 256
-152 - 256 = -408
256 - -408 = 664
image/svg+xml 8 56 -48 104 -152 256 -408 ?

Question statistics

Overview
Question ID: owxAM9XV
Main category: Numerical Reasoning
Sub category: Number sequences
Difficulty Level: 15What is item difficulty?
Nr of times answered: 2618
Average IQ of people who answered this question: 110.72
Percentage of answers correct: 51.64%
Item Response Theory (IRT)What is Item Response Theory?
Item difficulty: 15 / 20What is item difficulty?
Discrimination: 1.46 What is item discrimination?
Point of Maximum Information: 115.04 What is Point of Maximum Information?
Item Characteristic Curve (ICC)
This Item Characteristic Curve shows the probability that a person with a given IQ level will correctly answer this question. This graph is based on the answers and the IQ levels of 2618 individual test takers who have answered this question.
Distractor AnalysisWhat is distractor analysis?
Average IQ of people who gave the correct answer: 113.07 Why does the average IQ of people who answer the questions differ per question?
Average IQ of people who gave an incorrect answer: 108.09
Percentage per answer
The graph illustrates the percentage of individual test takers, 2618 in total, who selected each answer option for this question.
Average IQ per answer
The graph displays the average IQ of test takers who chose each answer option. In an effective question, the average IQ of test takers who selected the correct answer should be significantly higher than that of test takers who selected the other options, also known as distractors.

Time spent: you used 93 seconds to answer this question