Statistics Test...

The choices of the fruits of 42 students in a class are as follows:
A, O, B, M, A, G, B, G, A, G, B, M. A, O, M, A, B, G, M, B, A, O, M, O, G, B, O, M, G, A, A, B, M, O, M, G, B, A, M, O, M, O,

The median of the data : $$ 3,4,5,6,7,3,4$$ is  

What is the mode of $$19, 19, 15, 20, 25, 15, 20, 15$$?

If maximum cost of any times is Rs. 500 and minimum Rs 75, the coefficient of range will be - 

Coefficient of range of variable series $$ 10, 20, 30, 40, 50, 60 $$ is 

Marks obtained by students are $$ 25, 35, 45 $$ and $$55 $$ their mean deviation is -

coefficient of Range can be defined as - 

In a series $$\sum x^{2} = 100, n = 5 $$ and  $$\sum x = 20 $$ , then standard deviation is 

If $$ N = 10 \sum x = 120 $$ and $$ \sigma _{x} = 60 $$ , the variation coefficient is - 

Standard deviation of data $$6, 10, 4, 7, 4, 5$$ is -