{"id":27405,"date":"2021-08-24T17:18:18","date_gmt":"2021-08-24T17:18:18","guid":{"rendered":"https:\/\/analystprep.com\/cfa-level-1-exam\/?p=27405"},"modified":"2026-03-05T19:12:05","modified_gmt":"2026-03-05T19:12:05","slug":"multiplication-and-addition-rules-for-probability","status":"publish","type":"post","link":"https:\/\/analystprep.com\/cfa-level-1-exam\/quantitative-methods\/multiplication-and-addition-rules-for-probability\/","title":{"rendered":"Cumulative Distribution Function (CDF)"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"ImageObject\",\n  \"url\": \"https:\/\/cdn.analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2019\/10\/05092010\/page-107.jpg\",\n  \"caption\": \"Cumulative Distribution\",\n  \"width\": 1463,\n  \"height\": 820,\n  \"copyrightNotice\": \"\u00a9 2024 AnalystPrep\",\n  \"acquireLicensePage\": \"https:\/\/analystprep.com\/license-info\",\n  \"creditText\": \"AnalystPrep Design Team\",\n  \"creator\": {\n    \"@type\": \"Organization\",\n    \"name\": \"AnalystPrep\"\n  }\n}\n<\/script>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"QAPage\",\n  \"mainEntity\": {\n    \"@type\": \"Question\",\n    \"name\": \"Using the cumulative distribution, what is P(X \u2264 2)?\",\n    \"text\": \"Variable X can take the values 1, 2, 3, and 4 with probabilities 0.2, 0.3, 0.35, and 0.15 respectively. Construct the cumulative distribution and determine P(X \u2264 2).\",\n    \"answerCount\": 3,\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"The correct answer is B. The cumulative probability up to X = 2 equals 0.2 + 0.3 = 0.5. Therefore, P(X \u2264 2) = 0.5.\"\n    },\n    \"suggestedAnswer\": [\n      {\n        \"@type\": \"Answer\",\n        \"text\": \"0.3\"\n      },\n      {\n        \"@type\": \"Answer\",\n        \"text\": \"0.5\"\n      },\n      {\n        \"@type\": \"Answer\",\n        \"text\": \"0.85\"\n      }\n    ]\n  }\n}\n<\/script>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"VideoObject\",\n  \"name\": \"Common Probability Distributions (2021 Level I CFA\u00ae Exam \u2013 Reading 9)\",\n  \"description\": \"This CFA Level I video covers common probability distributions used in quantitative methods. Topics include discrete and continuous random variables, binomial and normal distributions, Z-scores, the central limit theorem, confidence intervals, and Monte Carlo simulations. Learn how these concepts apply to risk analysis, portfolio returns, and financial forecasting.\",\n  \"uploadDate\": \"2019-12-18T00:00:00+00:00\",\n  \"thumbnailUrl\": \"https:\/\/img.youtube.com\/vi\/KbEfz3KiJDo\/maxresdefault.jpg\",\n  \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=KbEfz3KiJDo\",\n  \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/KbEfz3KiJDo\",\n  \"duration\": \"PT45M31S\"\n}\n<\/script>\n\n\n\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/KbEfz3KiJDo?si=ob_OW5RXMTWu42RU\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n\n<p>A cumulative distribution function, \\(F(x)\\), gives the probability that the random variable \\(X\\) is less than or equal to \\(x\\):<\/p>\n<p>$$ P(X \u2264 x) $$<\/p>\n<p>By analogy, this concept is very similar to the cumulative relative frequency.<\/p>\n<p><!--more--><\/p>\n<p>A cumulative distribution is the sum of the probabilities of all values qualifying as &#8220;less than or equal&#8221; to the specified value. Perhaps an example will make this concept clearer.<\/p>\n<h4><strong>Example: Cumulative Distribution<\/strong><\/h4>\n<p>Suppose we flipped a coin three times. We would end up with the following probability distribution of the number of heads obtained:<\/p>\n<p>$$ \\begin{array}{c|c|c|c} \\text{Heads (outcomes)} &amp; {0} &amp; {1} &amp; {2} &amp; {3} \\\\ \\hline \\text{Probability} &amp; {1\/8} &amp; {3\/8} &amp; {3\/8} &amp; {1\/8} \\\\ \\end{array} $$<\/p>\n<p>To come up with a cumulative distribution function, we have to calculate the cumulative probabilities:<\/p>\n<p>The cumulative probability that X is less than or equal to zero is 1\/8.<\/p>\n<p>To find the cumulative probability that X is less than or equal to 1, we add P(X = 0) and (P = 1):<\/p>\n<p>$$ P(X \\le 1) =\\cfrac {1}{8} + \\cfrac {3}{8} = \\cfrac {1}{2} $$<\/p>\n<p>Similarly,<\/p>\n<p>$$ P(X \\le 2) = \\cfrac {1}{8} + \\cfrac {3}{8} + \\cfrac {3}{8} = \\cfrac {7}{8} $$<\/p>\n<p>Lastly,<\/p>\n<p>$$ P(X \\le 3) = \\cfrac {1}{8} + \\cfrac {3}{8} + \\cfrac {3}{8} +\\cfrac {1}{8} = 1 $$<\/p>\n<p>$$ \\begin{array}{c|c|c|c} \\text{Heads (outcomes)} &amp; {0} &amp; {1} &amp; {2} &amp; {3} \\\\ \\hline \\text{Probability} &amp; {1\/8} &amp; {3\/8} &amp; {3\/8} &amp; {1\/8} \\\\ \\hline \\text{Cumulative prob.} &amp; {1\/8} &amp; {4\/8} &amp; {7\/8} &amp; {8\/8} \\\\ \\end{array} $$<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1463\" height=\"820\" class=\"aligncenter size-full wp-image-16971\" style=\"max-width: 100%;\" src=\"https:\/\/cdn.analystprep.com\/cfa-level-1-exam\/wp-content\/uploads\/2019\/10\/05092010\/page-107.jpg\" alt=\"cumulative-distribution\" \/><\/p>\n<p>The CDF has two main properties:<\/p>\n<ol>\n<li>Sll values in the CDF are between 0 and 1; and<\/li>\n<li>The CDF either increases or remains constant as the value of the specified outcome increases.<\/li>\n<\/ol>\n<h3><strong>Interpreting the Cumulative Distribution Function<\/strong><\/h3>\n<p>A cumulative distribution function can help us to come up with cumulative probabilities pretty easily. For example, we can use it to determine the probability of getting at least two heads, at most two heads, or even more than two heads. The probability of at most two heads from the cumulative distribution above is 0.875.<\/p>\n<blockquote>\n<h2><strong>Question<\/strong><\/h2>\n<p>Variable X can take the values 1, 2, 3, and 4. The probability of each outcome has been given below.<\/p>\n<p>$$ \\begin{array}{c|c|c|c|c} \\text{Outcome} &amp; {1} &amp; {2} &amp; {3} &amp; {4} \\\\ \\hline \\text{Probability} &amp; {0.2} &amp; {0.3} &amp; {0.35} &amp; {0.15} \\\\ \\end{array} $$<\/p>\n<p>Construct a table showing the cumulative distribution and use it to determine P(X \u2264 2).<\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li data-tadv-p=\"keep\">0.3<\/li>\n<li data-tadv-p=\"keep\">0.5<\/li>\n<li data-tadv-p=\"keep\">\u00a00.85<\/li>\n<\/ol>\n<p><strong>Solution<\/strong><\/p>\n<p>The correct answer is <strong>B<\/strong>.<\/p>\n<p>You simply sum up the probabilities up to and including a given outcome and come up with a table similar to the one below:<\/p>\n<p>$$ \\begin{array}{c|c|c|c|c} \\text{Heads (outcomes)} &amp; {1} &amp; {2} &amp; {3} &amp; {4} \\\\ \\hline \\text{Probability} &amp; {0.2} &amp; {0.3} &amp; {0.35} &amp; {0.15} \\\\ \\hline \\text{Cumulative prob.} &amp; {0.2} &amp; {0.5} &amp; {0.85} &amp; {1} \\\\ \\end{array} $$<\/p>\n<p>From the table, it is clear that \\(P(X \\le 2) = 0.5\\).<\/p>\n<\/blockquote>\n<p><em>Note to candidates: the standard notation for a cumulative distribution function is written in upper case {F(x)}. In contrast, that of a probability function is written in lower case {f(x)}.<\/em><\/p>\n<div class=\"notes_inv\">\u00a0<\/div>","protected":false},"excerpt":{"rendered":"<p>A cumulative distribution function, \\(F(x)\\), gives the probability that the random variable \\(X\\) is less than or equal to \\(x\\): $$ P(X \u2264 x) $$ By analogy, this concept is very similar to the cumulative relative frequency.<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-27405","post","type-post","status-publish","format-standard","hentry","category-quantitative-methods","blog-post","no-post-thumbnail","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Addition &amp; Multiplication Rules in Probability | CFA<\/title>\n<meta name=\"description\" content=\"Master addition and multiplication rules in probability. 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