Question

The mean of four numbers is 9. Three of the numbers are 5, 8, and 13. Find the fourth number

Answer 1

Answer:

9=(8+x) /2

8+x=18

x=18-8=10

Answer 2

Answer:

Answer is 10

Step-by-step explanation:

Mean of group numbers = $(x_1+x_2+x_3....x_n)$/Total number of elements

Here,

Lets take fourth number as 'x'

=>(5+8+13+x)/4 = 9

=>(26+x)/4 = 9

=>26+x = 9x4

=>x = 36-26

=>x = 10

So,

The fourth number of the given data is 10

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