Question 7 • Grade 7 Mathematics
Steps 1 and 2 are correct: the scores total 312, and 312 ÷ 4 = 78. To find the mean absolute deviation, Souta must use the absolute differences from 78, so the differences are 2, 16, 16, and 2. Step 3 adds signed differences instead, which cancel to 0; therefore, the first error is Step 3.
AI-written and checked against the verified answer.