Question

STATISTICS - College graduates, married, probability rules.
http://i1084.photobucket.com/albums/j409/QRAWarrior/STAB22/B22-IMG-003.png

Answer 1

@Zarkon
@Callisto
@ParthKohli (Do you know Statistics?)

Answer 2

Let there be 100 workers
It's given 70 % are married, so there are 70 married workers, hence there are 30 unmarried
42% are college graduates, so there are 42 college graduate workers
it's given that 60 % of college graduates are married so, \(\frac{60}{100}\times 42=25.2\) college graduates are married
Do you get till here?

Answer 3

1. 70% married => 30% not married

2. 42% graduate, 60% are married
=> 40% of graduates are not married. => (40% x 42% = 0.168) is the proportion of graduates who has not married yet.

3. Non-graduates who are not married = 30% - 0.168 = 0.132

4. Non-graduates = 1-42% = 0.58

5. P(non-graduates or not yet married)
= P(non-graduates) + P(not yet married) - P(non-graduates who are not yet married)
= 0.58 + 30% - 0.132

**'=>' means 'that means'