Statisticshard · Past Paper
A student's marks in 5 subjects are 70, 75, 80, 85, and 90. What is the mean absolute deviation about the mean?
A6
B80
C30
D10
✓ Correct Answer: A — 6
Mean = 80. Deviations from 80 are: |-10|, |-5|, |0|, |5|, |10|. Sum = 30. Mean Deviation = 30/5 = 6.
Share this question
More from Statistics
- If P(A) = 2/3 and P(not A) = x/9, what is the value of x?
- The median of observations 11, 12, 14, 18, x+2, x+4, 30, 32, 35, 41 arranged in ascending order is 24. Find x.
- If Σf = 100, and the median is found at the 50th position, what is the value of N/2 used in the continuous median formula?
- If Q1 = 15 and Q3 = 35, what is the interquartile range?
- The arithmetic mean of 1, 2, 3, ... n is: