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    <h2 class="text-xl font-bold mb-4">Chapters</h2>
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      <li class="text-gray-700"><a href="#" class="hover:text-blue-500">Chapter 1: Application of Derivatives and Graphing Functions</a></li>
      <li class="text-gray-700"><a href="#" class="hover:text-blue-500">Chapter 2: Integration</a></li>
      <li class="text-gray-700"><a href="#" class="hover:text-blue-500">Chapter 3: Methods to Determine Space Coordinates</a></li>
      <li class="text-blue-500 font-bold"><a href="#" class="hover:text-blue-600">Chapter 4: Some Key Elements of Statistics and Probability</a></li>
      <li class="text-gray-700"><a href="#" class="hover:text-blue-500">Chapter 5: Extensions (optional topics)</a></li>
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      <h3 class="text-lg font-semibold">Course Challenge</h3>
      <p class="text-gray-600">Take the challenge for this course to assess your progress.</p>
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    <h1 class="text-3xl font-bold mb-4">Chapter 4: Some Key Elements of Statistics and Probability</h1>
    <p class="text-gray-600 mb-4">Earn up to <span class="font-bold">500 points</span> for completing this chapter.</p>
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        <h2 class="text-xl font-semibold">Understanding Statistics</h2>
        <p class="text-gray-700">Statistics is the study of data. It involves collecting, analyzing, interpreting, presenting, and organizing data.</p>
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        <h2 class="text-xl font-semibold">Probability Basics</h2>
        <p class="text-gray-700">Probability is a measure of the likelihood that an event will occur. It ranges from 0 to 1.</p>
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        <h2 class="text-xl font-semibold">Key Statistical Concepts</h2>
        <p class="text-gray-700">Key concepts include mean, median, mode, variance, and standard deviation.</p>
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