Find the arithmetic mean of the first 7 prime numbers. (Give your answer nearest to two decimal places) 

The first 7 prime numbers are 2, 3, 5, 7, 11, 13, and 17.

Total of all the observations 

= 2 + 3 + 5 + 7 + 11 + 13 + 17

= 58

No. of observations=7

∴ Arithmetic Mean of all observations = $\frac{58}{7}=8.29$

Thus, the arithmetic mean of the first 7 prime numbers is 8.29.