Statistics

What is the mean of a-2, a, a+2

• a

• a-1

• a+1

• None

What is the median of the data 10 ,15 ,11, 6, 9, 14 ,12, 8, 16

• 10

• 11

• 12

• 10.5

What is mode of the data 1, 1, 1, 2 , 2, 2, 3, 3, 3 , 4 , 4, 4, 5, 5 ,5

• 1

• 2

• 1, 2, 3, 4, 5

• No mode

If the mean of the data 6, 9, 12, 8, 4, 0 , x and 4 is 6 then X=

• 5

• 4

• 6

• 0

What is mode of the data 5, 6, 5, 9, 5, 6, 10, 11, 5, 6, 7, 6, 9, 5

• 6

• 5

• 5, 6

• 5.5

In Step deviation method mean               $\overline{x}$  = a + $\frac{\Sigma f_{i\ }u_i}{\Sigma f_{i\ }}\times h$  . Here "a" means

• Class length

• Assumed mean

• Class mark

• Deviation.

For grouped data median is calculated by M =  $l$   + $\frac{\frac{n}{2}-cf}{f}\times\ h$  . Here " $l$  " means 

• Lower boundary

• Frequency 

• Class length

• Cumulative frequency

In deviation method the formula to calculate mean is given by

• $\overline{x}=\ a\ +\frac{\Sigma f_id_i}{\Sigma f_i}$

• $\overline{x}=\ a\ +\frac{\Sigma f_iu_i}{\Sigma f_i}\times h$

• $\overline{x}=\ \frac{\Sigma f_ix_i}{\Sigma f_i}$

• None

The formula to calculate mode for grouped data is

• $z=l\ +\frac{f_1-f_0}{2f_1-f_0-f_2}\times h$

• $z=l\ +\frac{f_1-f_0}{f_1-f_0-f_2}\times h$

• $z=l\ +\frac{f_1-f_0}{f_1-f_2}\times h$

• None

In calculating mean if assumed mean is equal to actual mean then $\Sigma f_id_i\ =$  

• 0

• 1

• Can't  determined 

• None