Question

The mean of 3 scores is 4.If the sum of first two scores is 6. Find the 3rd score.​

Answer 1

Step-by-step explanation:

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average of 3 scores is 4, so the sum of the 3 scores is 4 * 3 = 12.

the sum of the first two scores is 6.

the last score must be 12 - 6 = 6

first two scores is 6 and last score is 6 for a total of 12.

12 divided by 3 is equal to 4. which is the average of the 3 scores.

Answer 2

let three score be x,y,z

mean=(x+y+z)/3 = 4

x+y+z = 4×3 = 12

also sum of first two scores = 6

x+y = 6

(x+y) + z = 12

z = 12 - (x+y)

z = 12 - 6

third score = z = 6