Question

The frequencies of the scores 30,50,60 and 40 are respectively equal to x, x+2, x-8. and x+6. If the mean of these scores is 40, What is the frequency of the score 40 ?​

Answer 1

Answer:

qjq-frjt-ikf

here come

Answer 2

Answer:

x+,x+2,x-8=40

2x+2,x-8=40

2x+2+x=40-8=42

3x+2=42

3x=42-2=40

3x=40

x=20