9. All high school seniors are required to take a proficiency exam before graduating. A student passing both of the independent subjects (mathematics and language skills) would be awarded a diploma. A practice test given to this year's 9500 seniors resulted in the following numbers of failures: Subject area Number of students failing Mathematics 4275 Language skills 3325 What proportion of next year's seniors can be expected to fail to qualify for a diploma? 0.1575 b) 0.3465 c) 0.2925 d) 0.6425