PRC-2 · Chapter 8 · Question 15 of 60
The mean of 5 observations is incorrectly recorded as 40. Upon review, it was found that a value of 25 was mistakenly read as 50. What is the correct mean?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: A) 35
Explanation
Incorrect total sum = 5 * 40 = 200. The error added 25 too much (50 - 25). The correct sum is 200 - 25 = 175. The correct mean is 175 / 5 = 35.
More Statistical Measures of Data MCQs
- Q17If every observation in a statistical sample is divided by 10, how is the new arithmetic mean affected?
- Q18Which of the following statements accurately describes a skewed distribution curve?
- Q19How is a perfectly symmetrical frequency distribution defined visually?
- Q20Which of the following best defines the 'standard error' in statistical analysis?
- Q21If a constant value of 3 is systematically subtracted from every observation of variable Y, what will happen to the calculated correlation…