CBSE 11th Standard Maths Subject Statistics HOT Questions 2 Mark Questions With Solution 2021
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CBSE 11th Standard Maths Subject Statistics HOT Questions 2 Mark Questions With Solution 2021
11th Standard CBSE
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Reg.No. :
Mathematics
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Find the standard deviation and the variance of first n natural numbers.
(a) -
If \(\bar { x } \) is mean and \(MD\left( \bar { x } \right) \) is the mean deviation from mean then find the number of observations lying between \(\bar { x } -MD\left( \bar { x } \right) \) and \(\bar { x } +MD\left( \bar { x } \right) \) . Use the data 22,24,30,27,29,31,25,28,41,42.
(a) -
Calculate the mean deviation about median for the age distribution of 100 persons given below.
Age 16-20 21-25 26-30 31-35 36-40 41-45 46-50 51-55 Number 5 6 12 14 26 12 16 9 First, make the class intervals are of uniform length and then use the following formula.
\(Median\left( M \right) =l+\frac { \frac { N }{ 2 } -cf }{ f } \times h\quad and\quad MD\left( M \right) =\frac { \Sigma fi|{ x }_{ i }-M| }{ \Sigma fi } \)(a)
