{"id":1761,"date":"2022-07-04T18:51:23","date_gmt":"2022-07-04T11:51:23","guid":{"rendered":"https:\/\/ykhoataynguyen.com\/site\/?p=1761"},"modified":"2022-07-06T00:22:32","modified_gmt":"2022-07-05T17:22:32","slug":"xac-suat-thong-ke-yk18a2-ki-i-2020-2021","status":"publish","type":"post","link":"https:\/\/ykhoataynguyen.com\/site\/xac-suat-thong-ke-yk18a2-ki-i-2020-2021\/","title":{"rendered":"X\u00e1c su\u1ea5t th\u1ed1ng k\u00ea YK18A2 K\u00cc I 2020 -2021"},"content":{"rendered":"

TR\u01af\u1edcNG \u0110\u1ea0I H\u1eccC T\u00c2Y NGUY\u00caN<\/strong><\/p>\n

\u0110\u1ec0 THI GI\u1eeeA H\u1eccC K\u1ef21 | N\u0102M H\u1eccC 2020 -2021<\/p>\n

M\u00f4n thi: X\u00e1c su\u1ea5t v\u00e0 th\u1ed1ng k\u00ea<\/p>\n

Th\u1eddi gian: 75 ph\u00fat<\/em><\/p>\n

C\u00e2u 1. (2 \u0111i\u1ec3m)<\/strong><\/p>\n

Theo k\u1ebft qu\u1ea3 \u0111i\u1ec1u tra v\u1ec1 b\u1ec7nh lao, t\u1ef7 l\u1ec7 ng\u01b0\u1eddi b\u1ecb lao \u1edf m\u1ed9t v\u00f9ng n\u1ecd l\u00e0 0,001. Kh\u00e1m ng\u1eabu nhi\u00ean cho 50 ng\u01b0\u1eddi. T\u00ednh x\u00e1c su\u1ea5t \u0111\u1ec3:<\/p>\n

a) C\u00f3 \u00edt nh\u1ea5t m\u1ed9t ng\u01b0\u1eddi b\u1ecb lao<\/p>\n

b) T\u00ecm s\u1ed1 ng\u01b0\u1eddi kh\u00f4ng b\u1ecb lao c\u00f3 kh\u1ea3 n\u0103ng nh\u1ea5t v\u00e0 t\u00ednh x\u00e1c su\u1ea5t t\u01b0\u01a1ng \u1ee9ng.<\/p>\n

C\u00e2u 2. (3 \u0111i\u1ec3m)<\/strong><\/p>\n

M\u1ed9t h\u1ed9p \u0111\u1ef1ng 5 s\u1ea3n ph\u1ea9m trong \u0111\u00f3 c\u00f3 2 ph\u1ebf ph\u1ea9m. Ng\u01b0\u1eddi ta l\u1ea7n l\u01b0\u1ee3t ki\u1ec3m tra t\u1eebng s\u1ea3n ph\u1ea9m (kh\u00f4ng ho\u00e0n l\u1ea1i) cho \u0111\u1ebfn khi g\u1eb7p \u0111\u1ee7 2 ph\u1ebf ph\u1ea9m th\u00ec d\u1eebng l\u1ea1i. G\u1ecdi X \u0111\u1ea1i l\u01b0\u1ee3ng ng\u1eabu nhi\u00ean ch\u1ec9 s\u1ed1 s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c ki\u1ec3m tra. H\u00e3y l\u1eadp b\u1ea3ng ph\u00e2n ph\u1ed1i x\u00e1c su\u1ea5t c\u1ee7a X. T\u00ednh E(3X – 5); D(-2X+7)<\/p>\n

C\u00e2u 3. (2 \u0111i\u1ec3m)<\/strong>
\n| \u0110i\u1ec1u tra 100 ha l\u00faa, thu \u0111\u01b0\u1ee3c s\u1ed1 li\u1ec7u sau:<\/p>\n

S\u1ea3n l\u01b0\u1ee3ng (t\u1ea5n)—–4,8—–5,0—–5,2——5,4——5,6——-5,8<\/p>\n

S\u1ed1 ha——————–5——-10—– 31——–25——19——-10<\/p>\n

a) H\u00e3y t\u00ecm kho\u1ea3ng tin c\u1eady 99% cho n\u0103ng su\u1ea5t trung b\u00ecnh c\u1ee7a l\u00faa.<\/p>\n

b) V\u1edbi \u0111\u1ed9 tin c\u1eady 95% c\u1ea7n \u0111i\u1ec1u tra t\u1ed1i thi\u1ec3u bao nhi\u00eau ha l\u00faa \u0111\u1ec3 \u01b0\u1edbc l\u01b0\u1ee3ng n\u0103ng su\u1ea5t l\u00faa trung b\u00ecnh tr\u00ean kh\u00f4ng l\u1ec7ch qu\u00e1 0,05 t\u1ea5n so v\u1edbi l\u00fd thuy\u1ebft<\/p>\n

C\u00e2u 4. (3 \u0111i\u1ec3m):<\/p>\n

M\u1ed9t c\u00f4ng ty d\u1ef1 \u0111\u1ecbnh m\u1edf m\u1ed9t si\u00eau th\u1ecb t\u1ea1i m\u1ed9t khu d\u00e2n c\u01b0. \u0110\u1ec3 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng mua h\u00e0ng c\u1ee7a d\u00e2n c\u01b0 trong khu v\u1ef1c, ng\u01b0\u1eddi ta ti\u1ebfn h\u00e0nh \u0111i\u1ec1u tra v\u1ec1 thu th\u1eadp c\u1ee7a 100 h\u1ed9 trong khu v\u1ef1c v\u00e0 c\u00f3 b\u1ea3ng s\u1ed1 li\u1ec7u sau:<\/p>\n

Thu nh\u1eadp b\u00ecnh qu\u00e2n (ng\u00e0n\/ng\u01b0\u1eddi\/th\u00e1ng) —-150—–200—–250 —–300 ——350<\/p>\n

S\u1ed1 h\u1ed9 ————————————————— 8———15——– 38 —— 22——–17<\/p>\n

Theo b\u1ed9 ph\u1eadn ti\u1ebfp th\u1ecb th\u00ec si\u00eau th\u1ecb ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng c\u00f3 hi\u1ec7u qu\u1ea3 t\u1ea1i khu v\u1ef1c n\u00e0y khi thu nh\u1eadp b\u00ecnh qu\u00e2n h\u00e0ng th\u00e1ng c\u1ee7a c\u00e1c h\u1ed9 t\u1ed1i thi\u1ec3u l\u00e0 v\u00e0o kho\u1ea3ng 250 ng\u00e0n\/ng\u01b0\u1eddi\/th\u00e1ng. V\u1eady theo k\u1ebft qu\u1ea3 \u0111i\u1ec1u tra tr\u00ean, c\u00f4ng ty c\u00f3 n\u00ean quy\u1ebft \u0111\u1ecbnh m\u1edf si\u00eau th\u1ecb t\u1ea1i khu v\u1ef1c n\u00e0y hay kh\u00f4ng v\u1edbi m\u1ee9c \u00fd ngh\u0129a 5%.<\/p>\n

Ghi ch\u00fa: C\u00e1n b\u1ed9 coi thi kh\u00f4ng gi\u1ea3i th\u00edch g\u00ec th\u00eam<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

TR\u01af\u1edcNG \u0110\u1ea0I H\u1eccC T\u00c2Y NGUY\u00caN \u0110\u1ec0 THI GI\u1eeeA H\u1eccC K\u1ef21 | N\u0102M H\u1eccC 2020 -2021 M\u00f4n thi: X\u00e1c su\u1ea5t v\u00e0 th\u1ed1ng k\u00ea Th\u1eddi gian: 75 ph\u00fat C\u00e2u 1. (2 \u0111i\u1ec3m) Theo k\u1ebft qu\u1ea3 \u0111i\u1ec1u tra v\u1ec1 b\u1ec7nh lao, t\u1ef7 l\u1ec7 ng\u01b0\u1eddi b\u1ecb lao \u1edf m\u1ed9t v\u00f9ng n\u1ecd l\u00e0 0,001. Kh\u00e1m ng\u1eabu nhi\u00ean cho 50 ng\u01b0\u1eddi. …<\/p>\n","protected":false},"author":17,"featured_media":1581,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[],"class_list":["post-1761","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-de-thi"],"_links":{"self":[{"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/posts\/1761","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/comments?post=1761"}],"version-history":[{"count":1,"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/posts\/1761\/revisions"}],"predecessor-version":[{"id":1762,"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/posts\/1761\/revisions\/1762"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/media\/1581"}],"wp:attachment":[{"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/media?parent=1761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/categories?post=1761"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ykhoataynguyen.com\/site\/wp-json\/wp\/v2\/tags?post=1761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}