Question

if the mean of 10,12,18,11,p and 19 is 15,find the value of p

Answer 1

Mean = sum of outcomes / Total number of outcomes  

15 = 10 + 12 + 18 + 11 + p + 19 / 6  

15 x 6 = 70 + p  

90 = 70 + p  

p = 90 - 70  

p = 20

Answer 2

mean=sum of all observations÷total no
15=10 +12+18+11+19+p÷6
15=70+p÷6
give p=20