Question

The mean of 6 numbers is 30.If one number is excluded the mean is 29.Find the value of the excluded number

Answer 1

Answer:

The value of the excluded number is 35.

Step-by-step explanation:

Write out six letters to represent these six numbers;

a + b + c + d + e + f

---------------------------- = 30.  Note that if "f" is excluded,

              6

a + b + c + d + e

---------------------------- = 29.  

              5.  

Thus, a + b + c + d + e = (5)(29) = 145.  Replacing a + b + c + d + e in the first equation by 145, we get:

145 + f

----------- = 30,  which means that 145 + f = 180.  Solving for f, f = 35.

     6

The value of the excluded number is 35.