the mean grade in physics examination was 75 and the standard deviation was 5. Determine the grade of the student whose standard is -0.5
"\\mu=75 \\\\\n\n\\sigma=5"
Standard score z = -0.5
"z = \\frac{x- \\mu}{\\sigma} \\\\\n\n-0.5 = \\frac{x -75}{5} \\\\\n\n-2.5 = x -75 \\\\\n\nx = 75-25 = 50"
Answer: 50
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