{"id":244216,"date":"2025-07-04T21:25:24","date_gmt":"2025-07-04T21:25:24","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=244216"},"modified":"2025-07-04T21:25:26","modified_gmt":"2025-07-04T21:25:26","slug":"suppose-that-the-heights-of-adult-men-in-the-united-states-are-normally-distributed-with-a-mean-of-70-5-inches-and-a-standard-deviation-of-3-inches","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/04\/suppose-that-the-heights-of-adult-men-in-the-united-states-are-normally-distributed-with-a-mean-of-70-5-inches-and-a-standard-deviation-of-3-inches\/","title":{"rendered":"Suppose that the heights of adult men in the United States are normally distributed with a mean of 70.5 inches and a standard deviation of 3 inches"},"content":{"rendered":"\n<p>Suppose that the heights of adult men in the United States are normally distributed with a mean of 70.5 inches and a standard deviation of 3 inches. What proportion of the adult men in United States are at most 6 feet tall? (Hint: 6 feet = 72 inches.) Round your answer to at least four decimal places.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>To find the proportion of adult men in the United States who are at most 6 feet tall (72 inches), we can use the <strong>Z-score formula<\/strong> for a normal distribution: Z=X\u2212\u03bc\u03c3Z = \\frac{X &#8211; \\mu}{\\sigma}Z=\u03c3X\u2212\u03bc\u200b<\/p>\n\n\n\n<p>Where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ZZZ is the Z-score,<\/li>\n\n\n\n<li>XXX is the value we are interested in (72 inches),<\/li>\n\n\n\n<li>\u03bc\\mu\u03bc is the mean (70.5 inches),<\/li>\n\n\n\n<li>\u03c3\\sigma\u03c3 is the standard deviation (3 inches).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Calculate the Z-score<\/h3>\n\n\n\n<p>Given:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>X=72X = 72X=72,<\/li>\n\n\n\n<li>\u03bc=70.5\\mu = 70.5\u03bc=70.5,<\/li>\n\n\n\n<li>\u03c3=3\\sigma = 3\u03c3=3,<\/li>\n<\/ul>\n\n\n\n<p>Substitute these values into the Z-score formula: Z=72\u221270.53=1.53=0.5Z = \\frac{72 &#8211; 70.5}{3} = \\frac{1.5}{3} = 0.5Z=372\u221270.5\u200b=31.5\u200b=0.5<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Find the Proportion<\/h3>\n\n\n\n<p>The Z-score of 0.5 corresponds to the standard normal distribution. We now need to find the proportion of the population that lies to the left of this Z-score (i.e., at most 72 inches).<\/p>\n\n\n\n<p>To find this, we can refer to a Z-table (or use a calculator). A Z-score of 0.5 corresponds to a cumulative probability of about <strong>0.6915<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Interpret the Result<\/h3>\n\n\n\n<p>This means that approximately <strong>69.15%<\/strong> of adult men in the United States are at most 6 feet tall (72 inches).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Final Answer:<\/h3>\n\n\n\n<p>The proportion of adult men in the United States who are at most 6 feet tall is <strong>0.6915<\/strong> (or 69.15%).<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner5-405.jpeg\" alt=\"\" class=\"wp-image-244217\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Suppose that the heights of adult men in the United States are normally distributed with a mean of 70.5 inches and a standard deviation of 3 inches. What proportion of the adult men in United States are at most 6 feet tall? (Hint: 6 feet = 72 inches.) Round your answer to at least four [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-244216","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/244216","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=244216"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/244216\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=244216"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=244216"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=244216"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}