aof.sorular.net
Statıstıcs I
STATISTICS I (İSTATİSTİK) - (İNGİLİZCE) Dersi Basics of Probability soru cevapları
STATISTICS I (İSTATİSTİK) - (İNGİLİZCE) Dersi Basics of Probability soru detayı:
SORU:
There are 20 male and 30 female students in a class. 1/4 of male students and 1/3 of female students are wearing glasses. A student is choosen from this class. What is the probability of student being a female, if it is known that student wears glasses?
CEVAP:
Since 1/4 of males have glasses, there are 1/4*20=5 males with glasses and 15 without glasses.
Since 1/3 of females have glasses, there are 1/3*30=10 females with glasses and 20 without glasses. Thus we can prepare the following table. From the table it is easily seen that 2/3 of students with glasses are female.(10/15=2/3)
| Male | Female | TOTAL | |
| Glasses | 5 | 10 | 15 |
| NoGlasses | 15 | 20 | 35 |
| TOTAL | 20 | 30 | 50 |