A random variable X has expected value E(X) = 5 and E(X²) = 29. The variance is: MCQ with Answer and Explanation
Question
Report Error
Discuss this Question (0)
Practice More Statistics Questions
Question #1
Report Error
If the Cost of Living Index rises by 10%, a wage earner's real income remains unchanged only if nominal wages increase by:
Correct Answer: Option C
Explanation:
Real income = Nominal income / Price index. To keep real income constant when prices rise 10% (index ×1.10), nominal income must also rise 10% (×1.10), so the ratio remains unchanged.
Real income = Nominal income / Price index. To keep real income constant when prices rise 10% (index ×1.10), nominal income must also rise 10% (×1.10), so the ratio remains unchanged.
This question belongs to:
Accountancy and Statistics
Statistics
Question #2
Report Error
In a set of 10 numbers, the mean of the first 6 is 15 and the mean of the remaining 4 is 20. The combined mean is:
Correct Answer: Option A
Explanation:
Sum = 6×15 + 4×20 = 90+80=170. Combined mean = 170/10 = 17.
Sum = 6×15 + 4×20 = 90+80=170. Combined mean = 170/10 = 17.
This question belongs to:
Accountancy and Statistics
Statistics
Question #3
Report Error
In a table, the 'caption' refers to:
Correct Answer: Option D
Explanation:
Caption (or box-head) contains the headings for columns.
Caption (or box-head) contains the headings for columns.
This question belongs to:
Accountancy and Statistics
Statistics
No comments yet. Be the first to start the discussion!