Marks of 4 students are given in the table. All the marks are out of 100. taking all the six subjects together, approximately how much total percentage has been scored by Ravina?

78%

Percentage of Ravina = $\frac{marks\;scored\;in\;each\;subject}{total\;marks}$ x 100

                               = $\frac{80+78+84+70+85+70}{600}$ x 100

                              = $\frac{467}{600}$ x 100 = 77.8% or 78%