This seemingly elementary stats question stumped me. Anyone can help?

IN a test for eyesight, for which the scores vary from 0 to 6, the table below shows the distribution of these scores for some volunteers who took part in the test.

Score of < 2: 10 volunteers

Score of 2: 7 volunteers

Score of 3: 8 volunteers

Score of 4: x volunteers

Score of >= 5: 8 volunteers

If the mean score is 3, find the value of x.

The correct answer is 12.

maths whiz, fire away!

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