Question

Find the average marks of all prime numbers between 30 and 50.....

please reply fast.....

Answer 1

The prime numbers between 30 and 50 = 31,37,41,43,47.
Number of prime numbers between 30 and 50 =5
$mean = \frac{sum \: of \: observations}{total \: numberof \: observations}$
$mean = \frac{31 + 37 + 41 + 43 + 47}{5}$
$mean = \frac{68 + 84 + 47}{5}$
$mean = \frac{115 + 84}{5}$
$mean = \frac{199}{5}$
$mean = \frac{39.8}{1}$
$mean = 39.8$