The mean of 10, 12, 16, 20, p and 26 is 17 then the values of p is

Given observations :10,12,16,20,P,26

Number of observations $=6$

Mean of the observation  $=17$

We know that,

 Mean$=\frac{\text{sum of observation}}{\text{no}\text{. of observation}}$

$17=\frac{10+12+16+20+P+26}{6}$

$17\times 6=84+P$

$102=84+P$

$102-84=P$

$18=P$