The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.
Class Interval
Frequency
20-under 40
30
40-under 60
45
60-
Class Interval
Frequency
20-under 40
30
40-under 60
45
60-
举一反三
- The number of class intervals in a frequency distribution is usually between ___________.
- An error of commission is one where: A: A transaction has not been recorded. B: One side of a transaction has been recorded in the wrong class of account, such as non-current assets posted to inventory. C: An error has been made in posting a transaction. D: The digits in a number are recorded the wrong way round.
- A<br/>village has 100 under five children. The coverage of measles<br/>vaccine is 60%. Following a measles case 26 children<br/>developed measles. The secondary attack rate is() A: 25% B: 40% C: 50% D: 65%
- Where has the key been found A: Under the table. B: Under the desk. C: On the table.
- A cumulative frequency distribution lists the number of observations that are within or below each of the classes.