Here is the distribution for the grades for test #1; the average is 76.1. 

 30 -  34: [  2] ##
 35 -  39: [  0] 
 40 -  44: [  0] 
 45 -  49: [  0] 
 50 -  54: [  0] 
 55 -  59: [  3] ###
 60 -  64: [  5] #####
 65 -  69: [  1] #
 70 -  74: [  7] #######
 75 -  79: [  6] ######
 80 -  84: [ 13] #############
 85 -  89: [  8] ########
 90 -  94: [  4] ####