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

Total Questions: 50

31. If mean = (3 median - mode)/p, then the value of p is: [RRB NTPC 20/01/2021 (Morning) ]

Correct Answer: (b) 2
Solution:

32. Median of 14,14, 15,17,16,17,17,22,13 is: [RRB NTPC 20/01/2021 (Evening) ]

Correct Answer: (a) 16
Solution:

13, 14, 14, 15, 16, 17, 17, 17, 22 We observe that the middle number = 16
Median = 16

33. Let a set S = {1, 2, 2, 3, 3, 3, 4, 4, 4, 4}. Then the value of 4 × mean + 2 × mode − 8 × median is: [RRB NTPC 21/01/2021 (Morning)]

Correct Answer: (c) −4
Solution:

34. Find the median of the data 40, 50, 30, 20, 80, 70, 90, 50. Next, if 30 is replaced by 120, find the new median. The mean of the two medians found is ________. [RRB NTPC 25/01/2021 (Morning)]

Correct Answer: (a) 55
Solution:

35. Find the sum of mean and median of given data. 12, 10, 16, 18, 20, 26, 14, 28 [RRB NTPC 25/01/2021 (Morning)]

Correct Answer: (d) 35
Solution:

36. If the mean of x/2, x, x/3, x/4 and x/6 is 6, then value of x will be: [RRB NTPC 27/01/2021 (Morning) ]

Correct Answer: (b) 40/3
Solution:

37. In the given data if 30 is replaced by 100 then find the difference of the two medians. 80, 90, 40, 30, 20, 10, 70, 60, 50 [RRB NTPC 28/01/2021(Morning) ]

Correct Answer: (b) 10
Solution:

38. Find the mean height of the persons from the following data. [RRB NTPC 28/01/2021 (Morning) ]

Correct Answer: (d) 140 cm
Solution:

39. If the mean of the following data is k, then find the value of k. [RRB NTPC 28/01/2021 (Evening) ]

Correct Answer: (a) 4
Solution:

40. Find the arithmetic mean of the first 15 natural numbers. [RRB NTPC 29/01/2021 (Evening) ]

Correct Answer: (a) 8
Solution: