Descriptive Sta...

The standard deviation of a varibale x is$$\sigma $$. The standard devaition of the varibale $$\frac { ax+b }{ c } $$ where a, b, c are constant is _____________________.

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

Ina a class of 20 students, each student can score 10 or 0 marks in a certain examination. The maximum possible variance in the marks of the students in the class is

Two sets each of $$20$$ observations, have the same standard deviation $$'5'$$. The first set has a mean $$'17'$$ and the second set mean $$'22'$$ then standard deviation of the combining the given two sets is

In a series of $$100$$ observations, half of them is equal to $$p$$ and remaining half equal to $$-p$$ if the standard deviation of these observations is $$10$$ then $$|p|=$$__   

If the standard deviation of $$x_1,x_2,...,x_n$$ is 3.5 then the standard deviation of $$2x_1-3,2x_2-3,...,2x_n-3$$ is

If $$\sum _{ i=1 }^{ 9 }{ ({ x }_{ i }-5)=9 } $$ and $$\sum _{ i=1 }^{ 9 }{ { { ( }x_{ i }-5 })^{ 2 }=45 }, $$ then the standard deviation of the 9 items $${ x }_{ 1 },{ x }_{ 2, }.........{ x }_{ 9 }$$ is

If 25% of the items are less than 10 and 25%  are more than 40, then the coefficient of quartile deviation is

The standard deviation of $$50$$ values of a variable x is $$15$$; if each value of the variable is divided by $$(-3)$$; then the standard division of the new set of $$50$$ values of x will be

The quartile deviation of wages is