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First ten prime no 's = 2,3,5,7,11,13,17,19,23,29 Total number of observations = 10 Mean = Sum of all Observations / Total number of Observations = 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 10 = 129 / 10 = 12.9

Those no. which can be only divided by itself or 1 are called prime no. the first 10 prime no. are 2 3 5 7 11 13 17 19 23 29 mean=2+3+5+7+11+13+17+19+23+29/10 =12.9

First 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 sum of these numbers are 2+3+5+7+11+13+17+19+23+29 = 129 therefore, mean = sum of observation / no. of observation = 129/10 = 12.9

1st10 prime numbers _ 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 sum of these nos _ 2+3+5+7+11+13+17+19+23+29 = 129 mean = sum of observation / number of observation = 129/10 = 12.9

Total number of observations = 10

Mean = Sum of all Observations / Total number of Observations

= 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29

10

= 129 / 10 = 12.9