EASY
NDA & NA EE
IMPORTANT
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The standard deviation of the observations 5, 5, 5, 5, 5 is

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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 48
If two lines of regression are perpendicular, then the correlation coefficient r is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 49
The average marks obtained by the students in a class are 43. If the average marks obtained by 25 boys are 40 and the average marks obtained by the girl students are 48, then what is the number of girl students in the class?
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 50
Variance is always independent of the change of
MEDIUM
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 51
The harmonic mean H of two numbers is 4 and the arithmetic mean A and geometric mean G satisfy the equation 2A+G2=27. The two numbers are
HARD
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 52

Consider the following frequency distribution

Class interval 0-10 10-20 20-30 30-40 40-50
Frequency 14 x 27 y 15

If the total of the frequencies is 100 and mode is 25, then which one of the following is correct?

EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 53
The marks obtained by 13 students in a test are 10, 3, 10, 12, 9, 7,9, 6, 7, 10, 8, 6 and 7. The median of this data is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Mathematics>Chapter 31 - Statistics>Practice Exercise>Q 54
Consider the following statements
I. Both variance and standard deviation are measures of variability in the population.
II. The standard deviation is the square of the variance. 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 55
Coefficient of correlation is the measure of