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

Total Questions: 50

21. What is the mean of the first five Triangular Numbers? [RRB ALP Tier - I 10/08/2018 (Morning) ]

Correct Answer: (a) 7
Solution:

22. For a grouped data, if xᵢ is the class mark and fᵢ is the corresponding is the corresponding frequency, then by direct method, mean x is given by: [Group D 22/08/2022 (Afternoon)]

Correct Answer: (b) Σfᵢxᵢ / Σfᵢ
Solution:

23. Find the arithmetic mean of 5, 15, 23, 26 and 29. [Group D 23/08/2022 (Evening)]

Correct Answer: (c) 19.6
Solution:

24. Which of the following is the correct empirical formula? [Group D 24/08/2022 (Morning) ]

Correct Answer: (a)
Solution:

25. Find the median of: [Group D 24/08/2022 (Morning) ]

Correct Answer: (b) 43
Solution:

26. If the mean of the data 11, 17, x + 1, 3x, 19, 2x - 4, x + 5 is 21, then find the mode of the data. [Group D 24/08/2022 (Afternoon) ]

Correct Answer: (d) 19
Solution:

27. If the mean of the following data is 4, find the missing frequency. [Group D 24/08/2022 (Evening) ]

Correct Answer: (d) 3
Solution:

28. The frequency distribution here gives the monthly consumption of electricity of 60 consumers of a locality. What is the median of the data? [Group D 25/08/2022 (Morning) ]

Correct Answer: (a) 80.5
Solution:

29. Find the double of the lower limit of the modal class in the given data. [Group D 25/08/2022 (Afternoon) ]

Correct Answer: (c) 260
Solution:

30. Find the mean of the following data. [Group D 25/08/2022 (Evening) ]

Correct Answer: (c) 4.95
Solution: