Sinashlarning takrorlanishi

Javob: 1) 0,0022; 2) 0,9938; 3) 1; 4) 0,0499.
7. Ehtimollar nazariyasidan namunaviy hisob ishini 50% talaba muvaffaqiyatli bajaradi. Namunaviy hisob ishini 400 talabadan: 1) 180 talaba muvaffaqiyatli bajarishi ehtimolini; 2) 180 tadan kam bo’lmagan talaba muvaffaqiyatli bajarishi ehtimolini toping.
Javob: 1) 0,0054; 2) 0,977.8.
8.Tavakkaliga tanlangan detalning nostandart bo’lishi ehtimoli 0,1 ga teng. Standart detallarning eng ehtimolli soni 50 ga teng bo’lishi uchun necha detal olinishi
kerak?
Javob: 55.
9. n ta sinashning har birida ijobiy natija olish ehtimoli 0,9 ga teng. 0,96 ehtimol bilan kamida 120 ta tajribaning ijobiy natija berishi uchun nechta tajriba o’tkazilishi
kerak?
Javob: 140.
10. Fakultetda 1825 talaba bor. Fakultet talabalaridan 3 tasining tug’ilgan kuni 21 mart bo’lishining ehtimolini toping (yilning istalgan kunida tug’ilish ehtimolini deb hisoblanadi).
Javob: 0,1404.
11. Yo’lovchining poezdga kechikish ehtimoli 0,01 ga teng. 800 ta yo’lovchidan poezdga kechikadigan yo’lovchilarning eng ehtimolli sonini aniqlang va shu sondagi
kechikuvchilarning ehtimolini toping.
Javob: 8 va 0,1396.
12. Zavod bazaga 10000 ta standart buyum jo’natdi. Yo’lda buyumning o’rtacha 2% i shikastlanadi. Yo’lda 10000 buyumdan: 1) rosa 3 tasi shikastlanishi ehtimolini;
2) kamida 3 tasi shikastlanishi ehtimolini; 3) 9997 tasi shikastlanmasligi ehtimolini;
4) hech bo’lmaganda 9997 tasi shikastlanmasligi ehtimolini toping.
Javob: 1) 0,1804; 2) 0,3233; 3) 0,1804; 4) 0,8572.
13. Do’konga 1000 shisha meneral shuvi yuborildi. Tashish vaqtida shishaning sinib qolishi ehtimoli 0,003 ga teng. Do’konga: 1) rosa 2 ta; 2) 2 tadan kam;
3) 2 tadan ko’p; 4) kamida bitta singan shisha keltirilishi ehtimolini toping.
Javob: 1) 0,224; 2) 0,1992; 3) 0,5678; 4) 0,95.