Question

The mean of six numbers is 23. If one of the numbers is excluded, the
mean of the remaining numbers is 20. Find the excluded number.​

Answer 1

Answer:

mean= sum of numbers by total numbers

n=6

mean=23

23=sum of number by 6

138 =sum of number.............1

if 1 number is excluded

sum of observations by total

20=sum of number by 6-1=5

100= sum of the number..........2

subtract 1 and 2

138-100

=38

therefore excluded number is 38

Step-by-step explanation:

Answer 2

ANSWER...................,

The mean of 6 number = 23

The sum of 6 number = 6 × 23 = 138

If one number is excluded ,

Then mean of 5 number = 20

Sum of 5 number = 5 × 20 = 100

∴excluded number = 138 - 100 = 38