Find the mean of first six prime numbers.

First six prime numbers are:

2, 3, 5, 7, 11, 13

Mean = $\dfrac{\text{Sum of prime numbers}}{\text{Total number of prime numbers}}$

Sum of prime numbers = 2 + 3 + 5 + 7 + 11 + 13 = 41

Mean = $\dfrac{41}{6} \approx$ 6.83

Hence, mean of first six prime numbers is 6.83.