Questions
A train running at $\dfrac{7}{{11}}$ of its own speed reached a place in 22 hours. How much time could be saved if the train would have run at its own speed ?
- 7 hours
- 8 hours
- 14 hours
- 16 hours
The total numbers of squares on a chessboard is
- $206$
- $205$
- $204$
- $202$
The average weight of $A,B,C$ is $45kg$ . If the average weight of $A$ and $B$ be $40kg$ and that of $B$ and $C$ be $43kg$, find the weight of $B$ ?
- $21kg$
- $20kg$
- $38kg$
- $31kg$
In a call of 100 students there are 70 boys whose average marks in a subject is 75. If the average marks of the complete class is 72 . then the average marks of the girls is
- 73
- 65
- 68
- 74
.Twelve years hence a man will be four times as he was twelve years ago, then his present age is
- 20 years
- 25 years
- 28 years
- 30 years
David obtained 76,65,82,67,and 85 marks(out of 100) in English,Mathematics,Physics,Chemistry and Biology.What are his average marks?
- 75
- 69
- 72
- 76
Moving-averages:
- Give the trend in a straight line
- Measure the seasonal variations
- Smooth-out the time series
- None of them
The average weight of 10 men is decreased by 3 kg when one of them whose weight is 80 kg is replaced by a new person. The weight of the new person is
- 70
- 60
- 50
- 73
The problem given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statements(s) is / are necessary to answer the question.
How many marks did Tarun secure in English?
(i)The average marks obtained by Tarun in four subjects including English are 60.
(ii) The total marks obtained by him in English and Mathematics together are 170.
(iii)The total marks obtained by him in Mathematics and science together are 180.
- I and II only
- II and III only
- I and III only
- None of these
Choose the correct answer from the alternatives given.
A man covers a distance of $160$ km at $64 km/hr$ and next $160$ km at $80 km/hr$. What is his average speed for his whole journey of $320$ km?
- $73.00km/h$
- $71.11km/h$
- $70.50km/h$
- $72.25km/h$
Bira and his wife Sheena have two daughters aged $12$ and $16$. Sheena's mother and father, aged $65$ and $72$, also live with them. Bira is currently looking for work, but can't find any. His elder daughter completed class $10$ and prefers to look for work. Sheena prefers to stay at home to look after house works. How many unemployed members does Bira's family have?
- $1$
- $2$
- $3$
- $4$
A qualitative forecast
- predicts the quality of a new product.
- predicts the direction, but not the magnitude, of change in a variable.
- is a forecast that is classified on a numerical scale from $1$ (poor quality) to $10$ (perfect quality).
- is a forecast that is based on econometric methods.
Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
- $12 min$
- $15 min$
- $25 min$
- $50 min$
The first step in time-series analysis is to
- perform preliminary regression calculations.
- calculate a moving average.
- plot the data on a graph.
- identify relevant correlated variables.
In moving average method, we cannot find the trend values of some:
- Middle periods
- End periods
- Starting periods
- Between extreme periods