Practice Standard Deviation (s) - 4.1 | 20. Acceptability Criteria in Concrete Mix Design | Civil Engineering Materials, Testing & Evaluation - Vol 2
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Knowledge

4.1 - Standard Deviation (s)

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is standard deviation?

💡 Hint: Consider how spread out the data points are.

Question 2

Easy

Write the formula for standard deviation.

💡 Hint: Look for how we express the average deviations squared.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does a high standard deviation indicate in concrete testing?

  • Low variability
  • High variability
  • No variability

💡 Hint: Repeat the definition of standard deviation in your mind.

Question 2

True or False: A lower standard deviation means the testing results are more consistent.

  • True
  • False

💡 Hint: Think about what happens to data points with lower variability.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Given the compressive strength data of 22, 24, 25, 18, and 30 MPa, calculate the standard deviation and explain what it indicates about the quality of the concrete.

💡 Hint: Use the standard deviation formula methodically!

Question 2

A construction project mandates a characteristic strength of 35 MPa, and the concrete mix tests show a mean strength of 40 MPa with a standard deviation of 6 MPa. What does this imply about the design of the concrete mix?

💡 Hint: Reflect on how standard deviation affects average strength approval.

Challenge and get performance evaluation