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

Total Questions: 50

41. Find the median and the mode for the following set of numbers. 2, 2, 3, 5, 5, 5, 6, 8, 9 [RRB NTPC 07/04/2021 (Evening)]

Correct Answer: (a) Median = 5, Mode = 5
Solution:

2, 2, 3, 5, 5, 5, 6, 8, 9 Median of the given data = 5
Mode = 5

42. The mean of x and y is 400 and the ratio of x to y is 3 : 7. What is the value of y − x? [RRB NTPC 07/04/2021 (Evening)]

Correct Answer: (c) 320
Solution:

43. What is the median of the following data? 78, 56, 22, 34, 45, 54, 39, 68, 54, 84 [RRB NTPC 08/04/2021 (Morning)]

Correct Answer: (c) 54
Solution:

Increasing order of the given data is 22, 34, 39, 45, 54, 54, 56, 68, 78, 84 Median = 54

44. Find the mean of x + 77, x + 7, x + 5, x + 3 and x − 2. [RRB NTPC 08/04/2021 (Morning)]

Correct Answer: (d) x + 18
Solution:

45. If the standard deviation of a set of numbers is 3 and the arithmetic mean of these numbers is 6, what is the coefficient of variation of these numbers? [RRB NTPC 08/04/2021 (Morning)]

Correct Answer: (c) 50
Solution:

46. If mean of the following distribution is 26, then what is the value of k? [RRB NTPC 08/04/2021 (Evening) ]

Correct Answer: (c) 4
Solution:

47. Mean of the numbers 2,4,5,8,2 and 3 is m. The numbers 4, 3, 3, 5, m, 3 and p have mean m + 1, median q and mode r. What is the value of (p + q - r)? [RRB NTPC 08/04/2021 (Evening) ]

Correct Answer: (d) 14
Solution:

48. If the mean of observations x₁, x₂, x₃, …, xₙ is x̄, then: [RRB NTPC 24/07/2021 (Morning) ]

Correct Answer: (a)
Solution:

49. Mean of the given observations x + 1, x + 3, x + 5, x + 7 and x + 9 is 6 , then the value of x is: [RRB NTPC 24/07/2021 (Morning) ]

Correct Answer: (d) 1
Solution:

50. The following table gives a frequency distribution whose arithmetic mean is 33. Find the product of the possible values of K from the distribution. [RRB NTPC 24/07/2021 (Evening) ]

Correct Answer: (d) 2
Solution: