Homework Sourseintro to statistics the table shows results of a survey in w
intro to statistics;
the table shows results of a survey in which 3,405,100 public and 489900 private school teachers were asked about their full-time teaching experience
3,895,500
a) find the probability that a randomly selected private school teacher has 10 to 20 years full time teaching experience
b) find the probability that a randomly selected public school teacher has 3 to 9 years full time teaching experience
c) are the events \"being a public school teacher\" and haing more that 20 years experience independent?
d) find the probability that a randomly selected teacher has 3 to 9 years of full time teaching or is at private school?
| public | private | total | |
| less than 3 years | 456,300 | 115,600 | 571,900 |
| 3 to 9 | 1,144,100 | 151,900 | 1,296,000 |
| 10 to 20 years | 997,700 | 120,500 | 1,118,200 |
| more than 20 years | 3,405,100 | 489,900 | 3,895,500 |
Solution
