6. Table 1 shows marks that student A and student B got from test. Student A sat for 5 tests while student B sat for 4 test. Student B has mark x missing. STUDENT A STUDENT B Table 1 55 67 | 70 ||30 | 30 80 60 x 53 65 Given that the mean mark of student A is the same as the mean mark of student B, calculate the value of x.