Question

The mean of five numbers is 27. If one number is excluded, their mean is 25. Find the excluded number.

Answer 1

Step-by-step explanation:

the mean of 5 num =27

then

sum of 5 num/5=27

sum of 5 num =5×27=135

then

one num is excluded total num is 4

mean = sum of 4 num/4

24=sum of 4 num /4

24×4= sum of 4 num

96= sum of 4 num

excluded num = 135 - 96= 39

therefore excluded num = 39

Answer 2

Answer:

The mean of five no. = 27

Sum of observations /Toal obs. =27

Sum/5 =27

Sum=27×5=135.

Now, let the no. which is excluded be x

Sum - x/4=25

135 - x =25×4

x = 135 - 100

X =35

Therefore excluded no. is 35