Statistics Test...

The median of the data 30, 25, 27, 29, 35, 38, 28 is _______.

The difference between the maximum and the minimum observations in the data is

The arithmetic mean of 5 numbers is 27. lf one of the number is excluded the mean of the  remaining number is 25. Find the excluded number.

Which of the following is correct for the given data $$55, 38, 69, 24, 89$$?

The mean deviation of $$\displaystyle a^{3}+b^{3}\: and\: a^{3}-b^{3}$$ (when (a & b > 0) is

Consider the following groups A and B
A : 3, 4, 5,...... upto n terms
B : 15, 19, 23,..... upto n terms
If the mean deviations of groups A and B about their means are $$\displaystyle \alpha \: \: \: and\: \: \: \beta  $$ respectively then

In a class test in English $$10$$ students scored $$75$$ marks $$12$$ students scored $$60$$ marks $$8$$ scored $$40$$ marks and $$3$$ scored $$30$$ marks the mode for their score is:

The mean of $$20$$ observations is $$15$$. One observation $$20$$ is deleted and two more observations are included to the data. If the mean of new set of observations is $$15$$, then find the sum of the two new observations included.

The standard deviation of $$3x + 5, 3x + 7, 3x + 9, 3x + 11, 3x + 13, 3x + 15$$ and $$3x + 17$$ is ........... 

For the given data, SD = 10, AM = 20, the coefficient
of variation is____