1,334 prompts matching "Teach me mean, variance and standard deviation"
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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Practice: Comparing the inverse method with elimination for three equations
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Worked Example: The units of mass, and the SI unit
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Quiz: Why mass stays the same wherever the body is taken
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Spot My Mistake: The greatest and the least resultant of two given forces
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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Practice: Limiting friction, and the greatest value it can reach
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Spot My Mistake: The moment of a force whose line of action is not perpendicular
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Quiz: The point about which the total moment of a set of forces vanishes
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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Spot My Mistake: When Lami's theorem may be used, and when it may not
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Explain Back: A probability distribution table for a discrete random variable
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Quiz: The area under the normal curve, and what it represents
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Quiz: Writing a two-dimensional vector as a column
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Practice: The components of a vector given its magnitude and direction
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Spot My Mistake: Drawing a vector as a directed line segment
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Quiz: The direction cosines of a vector in three dimensions
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Practice: The dot product as the magnitudes times the cosine of the angle
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