Question

The mean of first eight prime numbers is

• A. $\frac{63}{8}$
  
• B. $\frac{73}{8}$
  
• C. $\frac{77}{8}$
  
• D. $\frac{71}{8}$
  

Answer 1

The correct option is C $\frac{77}{8}$


First eight prime numbers are 2, 3, 5, 7, 11, 13, 17 and 19.
Mean of observations =$\frac{\text{Sum of observations}}{\text{Total numbers of observations}}$
∴ Mean of first eight prime numbers = $\frac{2+3+5+7+11+13+17+19}{8}$
=$\frac{77}{8}$
Hence, the correct answer is option (c).