Question

If the mean of a set of 18 numbers is 10, then the sum of the numbers is
A)28
B)100
C)180
D)240​

Answer 1

Answer:

C) 180

Step-by-step explanation:

The sum of numbers is = mean *total number of observation

=> 18*10 = 180

Hence, 180 is the correct answer.

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Answer 2

Answer:

Correct option is B)

Mean of 5 numbers =18

⇒ Sum of these 5 numbers =18×5=90

Let number that has been excluded be x

New mean =

4

90−x

=16

Solving this, we get

90−x=64

∴x=26