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La llista següent mostra els minuts que els alumnes de 4t d'ESO es connecten al facebook durant un cap de setmana. <div> <table border="0" width="100%"><tbody> <tr> <td width="50%" valign="top"><span class="Apple-style-span"> <div style="text-align: center; ">#L1</div> <div style="text-align: center; ">#L2</div> <div style="text-align: center; ">#L3</div> <div style="text-align: center; ">#L4</div></span> </td> <td width="50%" valign="top"><img hspace="0" border="0" vspace="0" src="http://collection.wiris.com/data/quizzes/file.php/1/images/http___tech.blorge.com_wp-content_uploads_2009_11_facebook-logo1.jpg" alt="fb" title="fb" /><br /> </td> </tr></tbody> </table> <div> <div><br /></div> <div>Volem agrupar les dades en 6 intervals.</div> <div>Calcula el recorregut: r={:SA:=#rec}</div> <div>El recorregut múltiple de 6:<br />(si r ja ho és, cal posar el <span style="font-weight: bold; ">següent</span> múltiple) r'={:SA:=#rec2}</div> <div>Longitud de cada interval: l={:SA:=#long}</div> <div><br /></div> <div> <table cellspacing="2" cellpadding="2" border="1" style="width: 480px; height: 60px; text-align: left; "> <tbody> <tr> <td style="background-color: rgb(153, 51, 153); color: white; font-weight: bold; width: 340px; text-align: center; " border-color="black">INTERVAL </td> <td style="font-weight: bold; width: 78px; text-align: center; ">MARCA </td> <td style="font-weight: bold; text-align: center; ">FREQ </td> </tr> <tr> <td style="width: 200px; text-align: center; ">[#a1,{:SA:=#b1}) </td> <td style="width: 78px; text-align: center; ">{:SA:=#m1} </td> <td style="text-align: center; ">{:SA:=#f1} </td> </tr> <tr> <td style="text-align: center; ">[{:SA:=#a2},{:SA:=#b2}) </td> <td style="text-align: center; ">{:SA:=#m2} </td> <td style="text-align: center; ">{:SA:=#f2} </td> </tr> <tr> <td style="text-align: center; ">[{:SA:=#a3},{:SA:=#b3}) </td> <td style="text-align: center; ">{:SA:=#m3} </td> <td style="text-align: center; ">{:SA:=#f3} </td> </tr> <tr> <td style="text-align: center; ">[{:SA:=#a4},{:SA:=#b4}) </td> <td style="text-align: center; ">{:SA:=#m4} </td> <td style="text-align: center; ">{:SA:=#f4} </td> </tr> <tr> <td style="text-align: center; ">[{:SA:=#a5},{:SA:=#b5}) </td> <td style="text-align: center; ">{:SA:=#m5} </td> <td style="text-align: center; ">{:SA:=#f5} </td> </tr> <tr> <td style="text-align: center; ">[{:SA:=#a6},{:SA:=#b6}) </td> <td style="text-align: center; ">{:SA:=#m6} </td> <td style="text-align: center; ">{:SA:=#f6} </td> </tr> </tbody> </table><br /></div> <div>Calcula els estadístics següents:</div> <div><span class="nolink">«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mover»«mi»X«/mi»«mo»¯«/mo»«/mover»«mo»=«/mo»«/math»</span>{:SA:=#m}<br /></div> <div>mediana={:SA:=#me}</div> <div>Moda={:SA:=#mo} (si són dos valors, expressa-ho com {m1,m2})</div> <div>Var={:SA:=#var}</div> <div><span class="nolink">«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#963;«/mi»«mo»=«/mo»«/math»</span>{:SA:=#sig}</div> <div>C.V.={:SA:=#coef}</div></div></div>
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