{"id":21677,"date":"2026-05-25T22:57:21","date_gmt":"2026-05-25T16:57:21","guid":{"rendered":"https:\/\/mcqacademy.com\/en\/mcq\/probability-of-choosing-a-blue-marble\/"},"modified":"2026-05-25T22:57:21","modified_gmt":"2026-05-25T16:57:21","slug":"probability-of-choosing-a-blue-marble","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/en\/mcq\/probability-of-choosing-a-blue-marble\/","title":{"rendered":"Probability of choosing a blue marble"},"content":{"rendered":"\n<p>A box contains 2 blue marbles, 5 black marbles, and 2 orange marbles. If one marble is chosen without looking, what is the probability that it is blue?<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>2 blue marbles<\/li><li>5 black marbles<\/li><li>2 orange marbles<\/li><\/ul>\n\n\n\n<p>Choose the best answer.<\/p>\n<ul class=\"quiz-options\"><li>7\/9<\/li><li>5\/9<\/li><li>2\/9<\/li><li>1\/4<\/li><\/ul>","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[2907,2908],"subject":[2748],"education_level":[1894],"class_list":["post-21677","mcq","type-mcq","status-publish","hentry","topic-basic-probability","topic-favorable-outcomes","subject-probability-statistics","education_level-grade-8"],"mcq_note":"<p>For basic probability, compare the number of favorable outcomes with the total number of equally likely outcomes.<\/p><ul><li>Count the favorable outcomes first: there are 2 blue marbles.<\/li><li>Then count all possible outcomes: 2 + 5 + 2 = 9.<\/li><li>Probability means favorable outcomes divided by total outcomes, so the probability is 2\/9, which simplifies to 2\/9.<\/li><\/ul><p>The correct answer is 2\/9. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.<\/p>","mcq_options":[{"right":"no","answer":"7\/9"},{"right":"no","answer":"5\/9"},{"right":"yes","answer":"2\/9"},{"right":"no","answer":"1\/4"}],"multi_answers":"no","subject_terms":[{"id":2748,"title":"Probability &amp; Statistics","slug":"probability-statistics"}],"topic_terms":[{"id":2907,"title":"Basic Probability","slug":"basic-probability"},{"id":2908,"title":"Favorable Outcomes","slug":"favorable-outcomes"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq\/21677","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq"}],"about":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/types\/mcq"}],"author":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/comments?post=21677"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/media?parent=21677"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/topic?post=21677"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/subject?post=21677"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/education_level?post=21677"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}