Posted by **Anna** on Tuesday, January 5, 2010 at 4:27pm.

A survey of 850 students conducted in two schools showed the following results:

School A:

*Students who took the bus = 400

* Students who did not take the bus = 150

Total = 550

School B:

*Students who took the bus = 200

* Students who did not take the bus = 100

Total = 300

School C:

*Students who took the bus = 600

* Students who did not take the bus = 250

Total = 850

Calculate the probability that a randomly chosen student from this group of 850 students takes the bus and is from school A.

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