The school editorial staff does a feature article in each issue on one student picked at random..............?

The school editorial staff does a feature article in each issue on one student picked at random. The chart shows the mumber of male and female students for each grade . What is the probability that the student chosen will be either a 9th or 10th grade female?


(nrst 1000th)


Grade 9 Grade 10 Grade 11 Grade 12


m-240 m-180 m-160 m-165


f-190 f-205 f-200 f-210





a) 0.251


b)0.255


c)0.258


d)0.259


d)

The school editorial staff does a feature article in each issue on one student picked at random..............?
Total students = 1550


female 9th and 10th graders = 395





395/1550 = .255