Question

3,-1, 0, 5, 7, 5,
If the mean of 16, 14, x, 25, 35 is 21. Find the value of x.​

Answer 1

(16 + 14 + x + 25 + 35) / 5 = 21

16 + 14 + x + 25 + 35 = 21*5

=> 16 + 14 + x + 25 + 35 = 105

=> 90 + x = 105

x = 105 - 90

x = 15

$(16 + 14 + x + 25 + 35) / 5 = 2116 + 14 + x + 25 + 35 = 21*5=> 16 + 14 + x + 25 + 35 = 105=> 90 + x = 105x = 105 - 90x = 15$

Answer 2

To find :-

x in 16, 14, x, 25, 35 is 21

Soln :-

Mean » sum of all observations / no. of all observations

16 + 14 + x + 25 + 35 / 5 = 21

90 + x / 5 = 21

90 + x = 21 × 5

x = 105 - 90

x = 15

Therefore, x is 15