(b) Given, data of number are p,6,6,7,8,11,15 and 16. Mean‌x‌=‌
‌ Sum of all observations ‌
‌ Total number of observations ‌
‌=‌
p+6+6+7+8+11+15+16
8
‌⇒‌‌‌
69+p
8
=3p‌(given) ‌⇒‌‌24p−p=69⇒23p=69 ‌⇒‌‌p=3 So given data is 3,6,6,7,8,11,15,16 and mean is 9. So, the mean deviation ‌|3−9|+|6−9|+|6−9|+|7−9|+|8−9| =‌‌