Answers

2015-09-08T15:54:48+05:30
First 10 prime numbers = 2, 3, 5, 7, 11, 13, 17, 19, 23, 29

Mean =  \frac{2+3+5+7+11+13+17+19+23+29}{10} = \frac{129}{10}=12.9

Mean is 12.9
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2015-09-08T16:00:51+05:30
First five prime numbers= 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
its mean= 2+3+5+7+11+13+17+19+23+29/10
             =129/10= 12.9
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