A mean of three numbers is 19 . If two of them are 10 and 15 , find the third number
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Answer:
x=32
Step-by-step explanation:
let us consider the third no. as X
mean = sum of observations
_________________
total no. of observations
19 = 10+15+X
3
19 = 25+X
3
19×3 =25+x
57 = 25 + X
57-25 = X
x= 32
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