PRC-2 · Chapter 8 · Question 4 of 60
Group X consists of 40 items with a mean of 50. Group Y consists of 60 items with a mean of 70. What is the combined mean of the two groups?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 62
Explanation
Using the combined mean formula: ((n1 * Mean1) + (n2 * Mean2)) / (n1 + n2). This gives ((40 * 50) + (60 * 70)) / 100 = (2000 + 4200) / 100 = 6200 / 100 = 62.
More Statistical Measures of Data MCQs
- Q6What is the mathematical sum of the deviations of all individual observations from their arithmetic mean?
- Q7Which specific measure of central tendency is most mathematically appropriate for averaging rates of change, speed, or unit prices?
- Q8Which of the following values is perfectly equivalent to the Second Quartile (Q2) of a dataset?
- Q9How is the Interquartile Range (IQR) formally calculated?
- Q10A dataset contains the values 10, 10, 10, 10, and 10. What is the standard deviation of this set?