Select the random variable that is not discrete: Numbers are assigned according to the length of time it will take to get served at a bank. In a class of 30 students, numbers are assigned to according to the number of students who may pass a test next week. Numbers are assigned according to the number of days before a share price stops increasing. The number -1 is assigned to a share price falling tomorrow, the number 0 is assigned to the share price remaining stable, and the number 1 is assigned to the share price rising.
Select the random variable that is not discrete:
| Numbers are assigned according to the length of time it will take to get served at a bank. |
| In a class of 30 students, numbers are assigned to according to the number of students who may pass a test next week. |
| Numbers are assigned according to the number of days before a share price stops increasing. |
| The number -1 is assigned to a share price falling tomorrow, the number 0 is assigned to the share price remaining stable, and the number 1 is assigned to the share price rising. |