EASY
11th CBSE
IMPORTANT
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The standard deviation of first 10 natural numbers is

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Important Questions on Statistics

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11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 18
Consider the first 10 positive integers. If we multiply each number by -1 and then add 1 to each number, the variance of the numbers so obtained is
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 19
Consider the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. If 1 is added to each number, the variance of the numbers so obtained is
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11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 20
The mean of 100 observations is 50 and their standard deviation is 5. The sum of all squares of all the observations is
 
MEDIUM
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 21
Let x1,x2,…,xn be n observations. Let y1=axi+b for i=1,2,…,n, where a and b are constants. If the mean of i=1,2,…,n, is 48 and their stand ard deviation is 12, the mean of yi's is 55 and standard deviation of yi's  is 15 the values of a and b are
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 22
The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 from the mean is
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 23
The mean deviation for n observations x1, x2, …, xn from their mean X is given by
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 24
Let x1,x2,…,xn be n bservations and X be their arithmetic mean. The standard deviation is given by
EASY
11th CBSE
IMPORTANT
MATHEMATICS for CLASS XI>Chapter 32 - Statistics>MULTIPLE CHOICE QUESTIONS (MCQs)>Q 25
The standard deviation of the observations 6, 5, 9, 13, 12, 8, 10 is