EASY
NDA & NA EE
IMPORTANT
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What is the arithmetic mean of first 16 natural numbers with weights being the number itself?

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Important Questions on Statistics

EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 38

Consider the following statements:

I. A continuous random variable can take all values in an interval.

II. A random variable which takes a finite number of values is necessarily discrete.

III. Construction of a frequency distribution is based on data which are discrete.

Which of the above statement(s) is/are correct?

EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 39
If values of variable X are 2, 9, 3, 7, 5, 4, 3, 2 and 10, then what is its median?
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 40
What is the standard deviation of 7, 9, 11, 13 and 15?
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 41
Frequency curve may be
MEDIUM
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 42
The median of 27 observations of a variable is 18. Three more observations are made and the values of these observations are 16, 18 and 50. What is the median of these 30 observations?
MEDIUM
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 43
The algebraic sum of the deviations of 20 observations measured from 30 is 2. What would be the mean of the observations?
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 44
The arithmetic mean of numbers a, b, c, d and e is M. What is the value of (a-M)+(b-M)+(c-M)+(d-M)+(e-M)?
MEDIUM
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 45
What is the mean of the first n odd natural numbers?