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The sum of squares of deviation of variates from their A.M. is always

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Important Questions on Statistics

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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 13

If the mean of following frequency distribution is 2.6, then the value of f is

xi 1 2 3 4 5
fi 5 4 f 2 3
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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 14
The weighted mean W.M. is computed by the formula
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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 15
The weighted mean of first n natural numbers when their weights are equal to corresponding natural number is
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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 16
The average income of a group of persons is x¯ and that of another group is y¯. If the number of persons of both group are in the ratio 4:3, then average income of combined group is
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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 17
In a group of students, the mean weight of boys is 65 kg, and mean weight of girls is 55 kg. If the mean weight of all students of group is 61 kg, then the ratio of the number of boys and girls in the group is
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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 18
The median of an arranged series of n even observations will be
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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 19
The median of the number 6,14,12,8,10,9,11 is
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Beta Question Bank for Engineering: Mathematics>Chapter 24 - Statistics>EXERCISE-1>Q 20

Median of the following frequency distribution is

xi 3 6 10 12 7 15
fi 3 4 2 8 13 10