The numbers are in an arithmetic sequence (common difference = 6). Since there are 5 of them, their mean is the middle number: 79.
79
53 59 61 67 71 73 79 83 89 97.
61, 67, 71, 73, 79, 83, 89, 97, so 79 is nearest
47, 53, 59, 61, 57, 71, 73, 79
Any number except 61 67 71 73 and 79 which are prime numbers
To find the mean of the data set, first sum all the values: 64 + 80 + 64 + 70 + 76 + 79 + 67 + 72 + 65 + 73 + 68 + 65 + 67 + 65 + 70 + 62 + 67 + 68 + 65 + 64 = 1395. Then, divide the total by the number of values, which is 20. Thus, the mean is 1395 / 20 = 69.75.
53 59 61 67 71 73 79 83 89 97
53 59 61 67 71 73 79 83 89 97.
67, 71, 73, 79, 83, 89
61, 67, 71, 73, 79.
61 67 71 73 79.
They are: 67, 71, 73, 79