A study was conducted to explore the relationship between a child's birth order and the chances of becoming a juvenile delinquent. The subjects were a random sample of girls enrolled in public high schools in a large city. Each subject filled out a questionnaire that measured whether or not they had shown delinquent behavior as well as their birth order. The data are given in the table below.
|
Delinquent behavior |
|
Yes |
No |
| Oldest |
24 |
285 |
| In-between |
29 |
247 |
| Youngest |
35 |
211 |
| Only child |
23 |
70 |
Under the null hypothesis, the expected number of oldest children with delinquent behavior is
Please explain how did you get the result