Quiz about Statistics

Question 1

If $$(n)$$ is even, then median $$=$$

Accepted Answer

Covalent bond

Answer

$$\frac{1}{2}\left[\left(\frac{n}{2}ight)^{	ext {th }}ight.$$ observation $$+\left(\frac{n}{2}+1ight)^{	ext {th }}$$ observation $$]$$

Answer

$$\left(\frac{n+1}{2}ight)^{	ext {th }}$$ observation

Question 2

Facts or information collected with a definite purpose are called :

Accepted Answer

Covalent bond

Answer

data

Answer

frequencies

Question 3

Mean of $$15$$ observations is $$23$$ . If each observation is multiplied by $$2,$$ find new mean.

Accepted Answer

Covalent bond

Answer

$$46$$

Answer

$$36$$

Answer

$$26$$

Answer

$$76$$

Question 4

For the given data : $$11,15,17, y+1,19, y-2,3 ;$$ if the mean is $$14,$$ find the value of $$y$$

Accepted Answer

Covalent bond

Answer

$$17$$

Answer

$$15$$

Answer

$$23$$

Answer

$$45$$

Question 5

The median of the data $$78,56,22,34,45,54,39,68, 54,84$$ is

Accepted Answer

Covalent bond

Answer

$$ 54 $$

Answer

$$45 $$

Answer

$$49.5$$

Answer

$$56$$

Statistics Cbse Class 9 Maths Problems and Solutions