The mean of 10 observations is 25. If one observation is removed, mean becomes 24. Find removed value.
34
The total sum of the original 10 observations is \(10 \times 25 = 250\).
After removing one observation, there are 9 observations left with mean 24, so their sum is \(9 \times 24 = 216\).
The removed value equals the difference between the two sums: \(250 - 216 = 34\).
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Important Questions from Measures of Central Tendency
A random sample of 20 people is classified in the following table according to their ages:
Age
Frequency
15 – 25
2
25 – 35
4
35 – 45
6
45 – 55
5
55 - 65
3
What is the mean age of this group of people?
If the difference of mode and median is 36, then the difference of median and mean is:
In a Mathematics test 15 students scored 80 marks, 20 students scored 75 marks, 28 students scored 65 marks and 25 students scored 60 marks, mode of the score is:
If the mode of the scores 10, 12, 13, 15, 15, 13, 12, 10, x is 15, then what is the value of x?
The average of 25 numbers is 36. If the average of first 13 numbers is 32 and that of the last 13 numbers is 39, then the 13th number is
