Question

The mean of five numbers is 15. If one number is excluded, their mean remains 15.The
excluded number is
a) 15
b) 18
c) 16
d) 12

Answer 1

Answer:

the answer is 15

Step-by-step explanation:

mean =sum of observations/total no.of observations

mean= 15

total no of observations= 5

hence their sum of observation  would be 75

now 1 number is reduced

the mean remains 15,

hencex/4=15

x=15*4=60

x= 75-60= 15

the excluded number is 15

Answer 2

Answer:

The excluded number is a) 15

Step-by-step explanation:

The mean of five numbers is 15

So The sum of five numbers is 15 ×5 = 75

If one number is excluded, then the total number = 4

So sum = 4×15 = 60

So the excluded number is = 75 - 60 = 15

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