CA Foundation · Quantitative Aptitude · Measures of Central Tendency and Dispersion
The marks obtained by five students in a test are 45, 52, 48, 55, and 50. What is the arithmetic mean of their marks?
The arithmetic mean is 50, calculated by dividing the total sum of marks (250) by the number of students (5). This is the most basic measure of central tendency and gives the average value.
- A50Correct
- B51
- C52
- D53
Explanation
Sum of marks = 45 + 52 + 48 + 55 + 50 = 250. Arithmetic mean = 250 ÷ 5 = 50. The mean represents the average performance, and here all five students' scores centre around 50 marks.
Did you get it right without looking?
One question tells you little. A timed set on Measures of Central Tendency and Dispersion shows your real accuracy, how long you take and where you lose marks.
More Measures of Central Tendency and Dispersion questions
- For a distribution of daily sales, the first quartile is ₹24 thousand and the third quartile is ₹36 thousand. What is the coefficient of qua…
- Firm A has 40 employees with a mean monthly salary of ₹30,000. Firm B has 60 employees with a mean monthly salary of ₹25,000. What is the co…
- The harmonic mean of the three observations 2, 3 and 6 is:
- For a variable x, the mean is 50 and the standard deviation is 8. A new variable y is defined as y = 5 − 3x. What is the variance of y?
- A variable x has mean 20 and standard deviation 4. A new variable is defined as y = 3x − 5. The mean and standard deviation of y are respect…
- A dataset has values: 12, 18, 16, 14, 20, 16, 22. What is the median of this dataset?