Question

the mean of 5 number is 30 if one number is excluded there mean becomes 28 find the excluded number

Answer 1

Mean =(x1+x2---x5)/5

30=(x1+x2--x5)/5

5*30=(x1+x2---x5)

150=x1+x2--x5

If one number is excluded

Mean ={(x1+x2--x5)-x5}/4

28=(150-x5)/4

112=150-x5

150-112=x5

38=x5

38 is the excluded number

Answer 2

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