If the mean of the following data is 15. Find p.


x :



5



10



15



20



25



f :



6



p



6



10



5



X



f



fx



5



6



30



10



p



10p



15



6



90



20



10



200



25



5



125




N = p + 27



∑fx = 10p + 445



Given, mean = 15


= 15


= 15



15p – 10p = 445 – 405


5p = 40


p =


= 8


4