Measures of Dispersion of Grouped data

Calculate the standard deviation of the data.

• 30.36

• 5.510

• 5.430

• 3.110

The cumulative frequency table shows the distribution of mass of letters in a post box. If the mode class is 20 – 29, determine a possible value of y.

• 5

• 6

• 7

• 8

The diagram is the histogram showing the mass of 36 children. Calculate the mass mean, in kg, of a child.

• 24.5

• 29.5

• 27.0

• 32.0

The table shows the distribution of score obtained by a group of participants in a competition. The mean score of the participants is 7.04. Find the value of y.

• 2

• 3

• 4

• 5

The value of the 25th percentile is

• RM 15

• RM 20

• RM 25

• RM 30

Table above is a frequency distribution table which shows the heights of students in a class.

The mean height of the students is 161.6 cm. Find the value of x.

• 9

• 8

• 7

• 6