Me with the process to find the answer for #15, #16, #17 and #18

you it’s very much appreciated! : )

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

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

How do you write a paragraph proof to prove that the corresponding angles shown are congruent