Question 840570
.7*(84, 85, 95, 96, 97)/5=.7*457/5=319/5=63.98

63.98+.3x=70
x = 20.0667
you need at least 20.0667 on the final to pass.

Your average for the first five tests is 91%
It seems unlikely that you couldn't get at last 21 on the final.
To maintain your 91% average you need 90.0667