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

Total Questions: 50

21. The following observations are arranged in ascending order: If the median of the data is 19, then find the value of x. 6, 9, 15, x + 4, x + 8, x + 12, 30, 32 [RRB NTPC 12/01/2021 (Evening) ]

Correct Answer: (a) 13
Solution:

22. The arithmetic mean of x observations is m. If two observations 0 and m are added, then the new mean will be: [RRB NTPC 12/01/2021 (Evening) ]

Correct Answer: (d) m(x + 1)/x + 2
Solution:

23. If the mean of the following data is 15, then find the value of k. [RRB NTPC 13/01/2021 (Evening) ]

Correct Answer: (b) 8
Solution:

24. The following table shows the number of students of particular ages in a class of 40 students. Find the mean age of the students. [RRB NTPC 13/01/2021 (Evening) ]

Correct Answer: (b) 17.45
Solution:

25. Find the missing frequency (p) for the following distribution whose mean is 8: [RRB NTPC 16/01/2021 (Morning) ]

Correct Answer: (c) 25
Solution:

26. Find the mean of the following data: [RRB NTPC 16/01/2021 (Morning) ]

Correct Answer: (d) 25
Solution:

27. 40% is the passing criteria in an examination. Out of 9 students who appeared, 4 failed and the remaining received 80%, 55%, 52%, 66%, and 81% marks. The median of the percentage marks is equal to: [RRB NTPC 17/01/2021 (Evening)]

Correct Answer: (b) 52%
Solution:

28. The median of the data in ascending order 7, 11, 12, (x − y), (x + y), 20, 21, 29 is 16. Find the value of x. [RRB NTPC 19/01/2021 (Morning)]

Correct Answer: (b) 16
Solution:

29. The median of 4, 4, 5, 7, 6, 7, 7, 12, 3 is: [RRB NTPC 19/01/2021 (Evening)]

Correct Answer: (d) 6
Solution:

30. Sakshi attended to the following number of clients at the front desk during her internship for 15 days: 18, 20, 16, 17, 32, 17, 6, 16, 12, 13, 17, 28, 24, 45, 17 Find the average of the mode and median of the given data. [RRB NTPC 19/01/2021 (Evening)]

Correct Answer: (a) 17
Solution: