Many psychologists believe that birth order and personality are related. 400 elementary school children were randomly selected and then given a test to measure confidence. On the results of this test each of the students was classified as being confident or not confident. The numbers falling into each category are as follows: Firstborn Not firstborn Confident 62 60 Not confident 105 173 Find the probability that a randomly chosen student is: a- A firstborn (i.e. P(firstborn)) b- Confident (i.e. P(confident)) c- Confident, given he/she is firstborn (i.e. P(confident | firstborn))

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