Gabriela is building a brick wall. each row of bricks is 6.5\,\text{cm}6.5cm tall except that the top row is 1\,\text{cm}1cm shorter because it has no mortar. she wants the wall to be 259\,\text{cm}259cm tall.

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais