Question

(2) The mean of 5 numbers is 10.2. The mean of the 4 of these numbers is 10. Find the fifth number ​

Answer 1

Answer:

an et sum of 5 no. be x

and the sum of 4 no. be y

so 5th no. will be x-y

mean of x no. is 10.2

=x/5=10.2

=x=10.2×5

x=51______ eq.1

mean of 4 no. is 10

y/4=10

y=10×4

y=40 ____eq.2

fifth no. is x-y

from eq.1 and eq.2

fifth no. is 51-40=11

hope it helps buddy

Step-by-step explanation:

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Answer 2

x- y = 5

x/5 =10.5

x=10.5 ×5

x=51.0

y=10×4

y =40

51-40

3=11

5 equal to 11