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If the arithmetic mean of two numbers is 10 and their geometric mean is 8, the numbers are
The median of
0, 2, 2, 2, 3, 5, 1, 5, 5, 3, 6, 6, 5, 6 is
Consider the following table
The median of the above frequency distribution is
The mode of the following frequency distribution, is
The meandeviation of the data 3, 5, 6, 7, 8, 10, 11, 14 is
The mean deviation of the following distribution is
The standard deviation for the data 7, 9, 11, 13, 15 is
The probability that an event A occurs in one trial of an experiment is 0.4. Three independent trials of experiment are performed. The probability that A occurs at least once is
Eight coins are tossed simultaneously. The probability of getting at least 6 heads is
The ranks obtained by 10 students in Mathematics and Physics in a class test are as follows
The coefficient of correlation between their ranks is
If ∑x_{i} = 24, ∑y_{i} = 44, ∑x_{i}y_{i} = 306, ∑x_{i}^{2} =164 ,∑y_{i}^{2} = 574 and n = 4 then the regression coefficient b_{xy } is equal to
If ∑x_{i} = 30, ∑y_{i} = 42, ∑x_{i}y_{i} = 199 , ∑x_{i}^{2} =184 ,∑y_{i}^{2} = 318 and n = 6 then the regression coefficient b_{xy } is equal to
Let r be the correlation coefficient between x and y and b_{xy} ,b_{yx} be the regression coefficients of y on x and x on y respectively then
If b_{yx }= 1.6 and b_{xy} = 0.4 and θ is the angle between two regression lines, then tan θ is equal to
The equations of the two lines of regression are : 4x + 3y + 7 = 0 and 3x + 4y + 8 = 0. The correlation coefficient between x and y is
If cov(X, Y) = 10, var (X) = 6.25 and var(Y) = 31.36, then ρ(X,Y) is
If ∑x = ∑y = 15, ∑x^{2} = ∑y^{2} = 49, ∑xy = 44 and n = 5, then b_{xy} = ?
If ∑x = 125, ∑y = 100 , ∑x^{2} = 1650, ∑y^{2} = 1500 , ∑xy = 50 and n = 25, then the line of regression of x on y is
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65 videos121 docs94 tests
