Mean, Median & Mode (Railway Maths) (Part – III)

Total Questions: 50

1. Calculate the value of Range/Median for the set of data given below: 134, 98, 194, 122, 108, 156 [Level 2 (16/06/2022) Shift 3 ]

Correct Answer: (b) 3/4
Solution:

2. {1, 4, 7, 12, 13, 10, 11, 0, 0, 18, 37, 33, 29, 27, 16, 25, 28, 17, 19} What are the Mean, the Median and the Mode of the above set of data, in the same order, corrected to two decimal places? [Level 3 (17/06/2022) Shift 1]

Correct Answer: (c) 16.16, 16, 0
Solution:

3. Given are the scores of a batsman in the last 10 innings. Find the median score of the batsman in these innings. 65, 180, 81, 6, 63, 27, 122, 8, 165, 50 [Level 3 (17/06/2022) Shift 3]

Correct Answer: (b) 64
Solution:

4. The numbers 4, 6, 10, x, 20, 24, 32 are arranged in ascending order. Find the value of x if their mean and their median are equal. [Level 3 (17/06/2022) Shift 3]

Correct Answer: (c) 16
Solution:

5. In general, the most appropriate average value in measuring central tendency is. [RRB NTPC 28/12/2020 (Morning) ]

Correct Answer: (b) mean
Solution:

In general, the most appropriate average value in measuring central tendency is the mean. Central tendency is a descriptive summary of a dataset through a single value that reflects the centre of the data distribution. Along with the variability of the dataset, the central tendency is a branch of descriptive statistics.

6. Given below are the marks obtained by 20 students in mathematics out of 30 marks. 7, 9, 12, 12, 13, 12, 14, 14, 14, 14, 15, 16,17, 18, 18, 19, 20, 18, 20, 13. Then (2 × median - mode) of the data is equal to. [RRB NTPC 28/12/2020 (Evening) ]

Correct Answer: (a) 14
Solution:

7. If the ratio of mean and median of a certain data is 4 : 5, then find the ratio of its mean and mode. [RRB NTPC 29/12/2020 (Morning)]

Correct Answer: (d) 4 : 7
Solution:

8. The mean of 150 items was found to be 45. If at the time of calculation, two items were wrongly taken as 83 and 76 instead of 38 and 46, then the correct mean is [RRB NTPC 29/12/2020 (Morning)]

Correct Answer: (a) 44.5
Solution:

9. The marks obtained by 7 students in a class in mathematics are 43, 44, 65, 41, 53, 65 and 62. The mode of the data is [RRB NTPC 04/01/2021 (Morning)]

Correct Answer: (d) 65
Solution:

10. The sum of the deviations about the mean is always [RRB NTPC 05/01/2021 (Morning)]

Correct Answer: (b) zero
Solution:

The sum of the deviations about the mean is always zero i.e. the sum of deviations below the mean will always be equal to the sum of deviations above the mean.