<p>The following frequency distribution of marks has mean \(4.5\).</p>
<div class="content-block content-block--table"><div class="table-container"><table style="table-layout: fixed; width: 450px;"><colgroup><col style="width: 100px;"><col style="width: 50px;"><col style="width: 50px;"><col style="width: 50px;"><col style="width: 50px;"><col style="width: 50px;"><col style="width: 50px;"><col style="width: 50px;"></colgroup><thead><tr><th style="text-align: left; --cell-justify: flex-start"><p><strong>Mark</strong></p></th><th style="text-align: center; --cell-justify: center"><p>\(1\)</p></th><th style="text-align: center; --cell-justify: center"><p>\(2\)</p></th><th style="text-align: center; --cell-justify: center"><p>\(3\)</p></th><th style="text-align: center; --cell-justify: center"><p>\(4\)</p></th><th style="text-align: center; --cell-justify: center"><p>\(5\)</p></th><th style="text-align: center; --cell-justify: center"><p>\(6\)</p></th><th style="text-align: center; --cell-justify: center"><p>\(7\)</p></th></tr></thead><tbody><tr><td style="text-align: left; --cell-justify: flex-start"><p><strong>Frequency</strong></p></td><td style="text-align: center; --cell-justify: center"><p>\(2\)</p></td><td style="text-align: center; --cell-justify: center"><p>\(4\)</p></td><td style="text-align: center; --cell-justify: center"><p>\(6\)</p></td><td style="text-align: center; --cell-justify: center"><p>\(9\)</p></td><td style="text-align: center; --cell-justify: center"><p>\(x\)</p></td><td style="text-align: center; --cell-justify: center"><p>\(9\)</p></td><td style="text-align: center; --cell-justify: center"><p>\(4\)</p></td></tr></tbody></table></div></div>
<ol class="abc-list"><li><div class="list-item-paragraph">Find the value of \(x\).<span class="inline-marks">[4]</span></div></li><li><div class="list-item-paragraph">Write down the standard deviation.<span class="inline-marks">[2]</span></div></li></ol>

The following frequency distribution of marks has mean \(4.5\).

Mean and Standard Deviation for Ungrouped Data

Statistics

International Baccalaureate Standard Level Mathematics

Statistics - Mean and Standard Deviation for Ungrouped Data

Statistics - Mean and Standard Deviation for Ungrouped Data