Add all the quantities to find the total number of rolls:
60 +62 + 59 + 64 + 63 + 75 = 383
Now add the number of even numbered:
2 = 62
4 = 64
6 = 75
Total of even numbered rolls: 62 + 64 + 75 = 201
Divide the number of even rolls by the total number of rolls:
201 / 383 = 0.5248
Convert to a percent by multiplying by 100:
0.5248 x 100 = 52.48%
Rounded to nearest tenth = 52.5%