If the mean of the following data is 15, find p.


x :



5



10



15



20



25



y :



6



p



6



10



5



X



y



yx



5



6



30



10



p



10p



15



6



90



20



10



200



25



5



125




N = p + 27



∑yx = 10p + 445



Given,


Mean = 15


= 15


= 15


10p + 445 = 15 (p + 27)


10p + 445 = 15p + 405


15p – 10p = 445 – 405


5p = 40


p = = 8


4