Penjelasan dengan langkah-langkah:

Let's denote the mean score of the three other students by x.

The total score of the first 14 students is 14 * 6.5 = 91.

After the three other students take the test, there will be 17 students in total. The total score of all 17 students is (14 * 6.5) + (3 * x) = 91 + 3x.

We know that the new mean score is 6.2, so we can set up the equation:

(91 + 3x) / 17 = 6.2

Multiplying both sides by 17, we get:

91 + 3x = 17 * 6.2

Simplifying, we have:

91 + 3x = 105.4

Subtracting 91 from both sides, we get:

3x = 14.4

Dividing both sides by 3, we get:

x = 4.8

Therefore, the mean score of the three other students is 4.8.