Which of the following is not a measure of dispersion?

• Range

• Standard deviation

• Arithmetic mean

• Variance

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

The range of the data 8, 8, 8, 8, 8 . . . 8 is

• 0

• 1

• 8

• 3

Tags

CCSS.7.SP.B.4

The sum of all deviations of the data from its mean is

• Always positive

• Always negative

• zero

• non-zero integer

The mean of 100 observations is 40 and their standard deviation is 3. The sum of squares of all deviations is

• 40000

• 160900

• 160000

• 30000

Variance of first 20 natural numbers is

• 32.25

• 44.25

• 33.25

• 30

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

The standard deviation of a data is 3. If each value is multiplied by 5 then the new variance is

• 3

• 15

• 5

• 225

If the standard deviation of x, y, z is p then the standard deviation of 3x + 5 , 3y + 5 , 3z + 5 is

• 3p + 5

• 3p

• p + 5

• 9p + 15

If the mean and coefficient of variation of a data are 4 and 87.5% then the standard deviation is

• 3.5

• 3

• 4.5

• 2.5

Tags

CCSS.HSS.ID.A.4

Which of the following is incorrect?

• P (A) > 1

• 0 ≤ P (A) ≤ 1

• P(ɸ) = 0

• P (A) + P (A^-) = 1

Tags

CCSS.HSS.CP.A.1

The probability a red marble selected at random from a jar containing p red, q blue and r green marbles is

• 
• 
• 
• 

Tags

CCSS.7.SP.C.5

CCSS.7.SP.C.7