Question

The mean of x,y and z is 3x. In terms of x, the means of y and z is

(x,y and z are different numbers)

Answer 1

4x

Explanation:

Mean of a set of dats is the ratio of the sum of the data to its sample size;

Given the data x, y and z

Mean of the data = 3x

Sample size = 3

Mean = x+y+z/3

3x = x+y+z/3

Cross multiply

3(3x) = x+y+z

9x = x+y+z

y+z = 9x - x

y+z = 8x

Divide both sides by 2

y+z/2 = 8x/2

y+z/2 = 4x

Hence the mean of y and z in terms of x is 4x