In a class, the mean marks of boys is 50...

In a class, the mean marks of boys is 50 and the mean marks of girls is 40. If their total mean marks is 48 . Then the percentage of girls is

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25% of the students in a school are girls and others are boys. Form an equation and draw a graph for this. By observing the graph, answer the following : (i) Find the number of boys, if the number of girls is 25. (ii) Find the number of girls, if the number of boys is 45. (iii) Take three different values for number of boys and find the number of girls. Similarly take three different values for number of girls and find the number of boys?

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The mean of 100 observations is 50 and their standard deviation is 5. The sum of all squares of all the observations is ………….

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In a uniform magnetic field of induction B a wire in the form of a semicircle of radius r rotates about the diameter of the circle with angular frequency omega . The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R, the mean power generated per period of rotation is ......

KUMAR PRAKASHAN-STATISTICS-TEXTBOOK BASED MCQS

The sum of 20 observations of the deviation from 30 is 20. Their mean ...
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In a class, the mean marks of boys is 50 and the mean marks of girls i...
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The variance of 15 observations is 8. If each observation is multiplie...
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The standard deviation for the following data is n = 10 , sum x = ...
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Mean and standard deviation of 100 items are 50 and 4, respectively . ...
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While combined both groups new standard deviation is
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If the standard deviation of variable x is 4 and y = (3x + 7)/(4) then...
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The variance of observations 3,4,5,8 is
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The following data is for 15 observation obtained in an experiment. s...
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The mean deviation about mean of the observation 3, 10, 10, 4, 7, 10, ...
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Following are the marks obtained by 9 students in a mathematics test :...
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A series are 2n observations. The half of them is a and the reamaining...
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Median of nine observations is 20.45 . If 2 is added in last four obse...
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x1,x2, x3,………., xn are n observations . sum(i=1)^(n) (xi - 2) = 100 "...
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The standard deviation of four consecutive numbers in A.P. is sqrt5 . ...
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Variance of first n natural number is …………
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Range of the observations 2,3,5,9,8,7,6,5,7,4,3, is ………
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mean of the series a , a+d, a+2d,……………, a + 2nd is …..
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Which is not the measur of central tendency ?
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