Quartile Deviation Mean Deviation Variance and Standard Deviation of Grouped Data

The positive square root of variance is

• MD

• SD

• Range

• QD

It measures how spread out numbers are.

• Variance

• Range

• Standard Deviation

• Mean

What are values/ score points that divide a set of observations/distributions into an array of 4 equal parts?

• Decile

• Quartile

• Percentile

What is the standard deviation of the data?

• 0.92 cm

• 0.94 cm

• 0.98 cm

• 1.06 cm

You can find the ________________ by taking the square root of the variance.

• standard deviation

• cubed root

• range

• range rule of thumb

Find the mean for this given set of data.

• 23.5

• 25

• 27.15

• 20.67

The table shows the marks of 250 pre-university students in an examination. Estimate the first quartile and third quartile.

• 32.5; 68.0

• 30.5; 68.0

• 31.4; 67.7

• 30.5; 67.7

The table shows the marks of 250 pre-university students in an examination. Estimate the interquartile range.

• 38.1

• 36.2

• 37.5

• 36.9

Which of the following is the formula of variance for a grouped data?

The amount of rainfall for 75 days in a particular year were measured. Find the variance and standard deviation of the sample.

• 63.72; 7.98

• 64.84; 8.05

• 64.91; 8.06

• 65.25; 8.08