Explanation
Enter the data into the spreadsheet. Sort the values from smallest to largest.
You should get this new list
56, 57, 57, 57, 57, 57, 57, 58, 59, 59, 59, 60, 60, 61, 61, 61, 61, 61, 61, 62, 62, 62, 63, 63, 63, 64, 64, 64, 65, 66
Then we look at the subset of values smaller than 62. Those values are: 56, 57, 57, 57, 57, 57, 57, 58, 59, 59, 59, 60, 60, 61, 61, 61, 61, 61, 61
There are 19 values that are smaller than 62 out of 30 values total.
19/30 = 0.6333 = 63.33% approximately. Round this value however your teacher instructs.