Question

the mean of 5 numbers is 10.2 the mean of 4 number of these number is 10 find the fifth number​

Answer 1

Answer:

Step-by-step explanation:

let sum of 5 no. be x

and 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

Mean of 4no. Is 10

y/4=10

∴y=10×4

y=40

Therefore the 5th term is

x-y

= 51-40

=11

Answer 2

The the fifth number​ is 11

•Mean = (sum of all

observations)/(total no. of

observation)

• case 1

•mean = 10.2

• (sum of 5 observation)/5 = 10.2

• sum of 5 observation = 51

• case 2

• mean = 10

• (sum of 4 observation)/4 = 10

•sum of 4 observation = 40

• sum of 5 observation = sum of 4

observation + 5th Number

• 51 =40 + 5th Number

• 5th no. = 11