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

Total Questions: 20

11. If the mean of x + 45, x – 32, x + 25, x + 13 and x – 21 is 12, then what will be the mean of the last three observations? [ALP Tier II 08/02/2019 (Morning)]

Correct Answer: (d) 11.67
Solution:

12. The mean height of 25 boys in a class is 150cm, and the mean height of 35 girls in the same class is 145 cm. The combined mean height of 60 students in the class is _____________(approximately) [RRB ALP 09/08/2018 (Afternoon) ]

Correct Answer: (a) 147
Solution:

13. Four numbers, when arranged in ascending order, are w, x, y and z. The average of the smallest three numbers is 18, while the average of the largest three was 22. What is the range of the data ? [RRB ALP 09/08/2018 (Evening) ]

Correct Answer: (c) 12
Solution:

14. In a cricket match, the scores of the players are considered such that coefficient of variation of scores is 16 and mean is 25. then the variance is : [RRB ALP 14/08/2018 (Morning)]

Correct Answer: (c) 16
Solution:

15. If A, B and C are denoting Mean, Median and Mode of a data and A : B = 9 : 8 then the ratio of B : C is: [RRB ALP 17/08/2018 (Afternoon)]

Correct Answer: (d) 4 : 3
Solution:

16. The sum of 15 observations of a data is (434 + x). If the mean of the data is x, then the value of x is [RRB ALP 20/08/2018 (Afternoon)]

Correct Answer: (d) 31
Solution:

17. A sequence a, ax, ax² _____ axⁿ has odd number of terms. Then the median is [RRB ALP 20/08/2018 (Evening)]

Correct Answer: (d)
Solution:

18. The following table shows the gain in weight by 25 children in a year. What is the mean value of gain in weight? [RRB ALP 29/08/2018 (Afternoon) ]

Correct Answer: (c) 2.4
Solution:

19. The mean of the 5 smallest numbers from a group is 15 while the mean of all the numbers of the group taken together is 17. If the mean of the numbers leaving the smallest five out is 18.25, how many numbers were there in the group in all? [RRB ALP 29/08/2018 (Afternoon)]

Correct Answer: (c) 13
Solution:

20. Given below are the ages (in years) of a group of children. What is the median age? 7, 9, 8, 6, 5, 3, 9, 2. [RRB ALP 31/08/2018 (Morning)]

Correct Answer: (a) 6.5
Solution: