Sample Activity

The frequency for
10 < t £ 20
is 20
The estimated mean length of a call is about 7·6 minutes The frequency density for
1 < t £ 3
is 8
The frequency density scale goes up in twos
The total number of calls is 16 The modal group is
10 < t £ 20
The median length of a call lies in the group
5 < t £ 10
The frequency for
3 < t £ 5
is 4
The frequency density for
5 < t £ 10
is 45
There were 61 calls in total The frequency density for
5 < t £ 10
is 3
The frequency for
10 < t £ 20
is 5

Use the table and diagram to work out which statements (about the lengths of calls to a telephone switchboard) are correct

EXIT
 Minutes 
 Frequency 
 0 < t £
6
 1 < t £
16
 3 < t £
 
 5 < t £ 10 
15
 10 < t £ 20