// Numbas version: exam_results_page_options
{"name": "Summation notation 3", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Summation notation 3", "tags": ["rebel", "Rebel", "REBEL", "rebelmaths", "summation"], "metadata": {"description": "<p>Practice use of summation notation for regression question.</p>\n<p>rebelmaths</p>", "licence": "Creative Commons Attribution 4.0 International"}, "statement": "<p>The following table lists five pairs of $x$ and $y$ values.</p>\n<table height=\"91\" border=\"1\" width=\"573\">\n<tbody>\n<tr><th align=\"left\"><strong>$\\mathbf{x}$</strong></th><th><strong>{x1}</strong></th><th><strong>{x2}</strong></th><th><strong>{x3}</strong></th><th><strong>{x4}</strong></th><th><strong>{x5}</strong></th></tr>\n<tr><th align=\"left\"><strong>$\\mathbf{y} $</strong></th>\n<td><strong>{f1}</strong></td>\n<td><strong>{f2}</strong></td>\n<td><strong>{f3}</strong></td>\n<td><strong>{f4}</strong></td>\n<td><strong>{f5}</strong></td>\n</tr>\n</tbody>\n</table>", "advice": "", "rulesets": {}, "extensions": [], "variables": {"f3": {"name": "f3", "group": "Ungrouped variables", "definition": "random(5 .. 20#1)", "description": "", "templateType": "randrange"}, "f2": {"name": "f2", "group": "Ungrouped variables", "definition": "random(5 .. 20#1)", "description": "", "templateType": "randrange"}, "x4": {"name": "x4", "group": "Ungrouped variables", "definition": "random(2 .. 10#1)", "description": "", "templateType": "randrange"}, "f4": {"name": "f4", "group": "Ungrouped variables", "definition": "random(5 .. 20#1)", "description": "", "templateType": "randrange"}, "f5": {"name": "f5", "group": "Ungrouped variables", "definition": "random(5 .. 20#1)", "description": "", "templateType": "randrange"}, "x3": {"name": "x3", "group": "Ungrouped variables", "definition": "random(2 .. 10#1)", "description": "", "templateType": "randrange"}, "x1": {"name": "x1", "group": "Ungrouped variables", "definition": "random(1 .. 10#1)", "description": "", "templateType": "randrange"}, "f1": {"name": "f1", "group": "Ungrouped variables", "definition": "random(2 .. 20#1)", "description": "", "templateType": "randrange"}, "x5": {"name": "x5", "group": "Ungrouped variables", "definition": "random(2 .. 10#1)", "description": "", "templateType": "randrange"}, "x2": {"name": "x2", "group": "Ungrouped variables", "definition": "random(2 .. 10#1)", "description": "", "templateType": "randrange"}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["f1", "f2", "f3", "f4", "f5", "x2", "x3", "x1", "x4", "x5"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>$\\sum x = $ &nbsp;[[0]]</p>\n<p>$\\sum y&nbsp;= $ [[1]]</p>\n<p>$\\sum xy = $ [[2]]</p>\n<p>$\\sum x^2 =$ [[3]]</p>\n<p>$\\sum y^2 =$[[4]]</p>", "stepsPenalty": 0, "steps": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "showCorrectAnswer": true, "showFeedbackIcon": true, "scripts": {}, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "adaptiveMarkingPenalty": 0, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "prompt": "<p>$\\Sigma$ just means 'sum of' or total.</p>\n<p>For example:</p>\n<p>$\\Sigma x$ means add up the $x$ values</p>\n<p>$\\Sigma y^2 $ means square each of the $y$ values, then add up all the answers.&nbsp;</p>"}], "gaps": [{"type": "numberentry", 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