Question

a group of four numbers as an arithmetic mean of 10.
three of the numbers are 3,7,16.
what is the other number? ​

Answer 1

Answer:

14

Step-by-step explanation:

let the fourt number be x

then mean=

(3+7+16+x)/4=10

26+x=40

x=40-26

x=14

Answer 2

Given:

Mean of four numbers = 10.

Three of the numbers = 3 , 7 , 16.

To find :

The fourth number.

Formula to be used:

Mean = Sum of all data / Number of data

Solution:

Step 1 of 2:

Let the unknown number be x.

To find x,  Substitute the given values in the formula ,

Mean = Sum of all data / Number of data

10 = $\frac{3 + 7 + 16 + x }{4}$

10 = $\frac{26 + x}{4}$

10 × 4 = 26 + x

40 = 26 + x

40 - 26 = x

∴ x = 14

Final answer:

The other number is 14 .