سؤالين احصاء؛؛تعالو حلوها

[shaima]

q 6 : from sample test A 1430-1431

the complenet of guesing 10 incorrect answers on a 10 question T/F exam is :
a- guessing at least 1 correct answer

b-........
c- guessing 10 correct answers
d-......

الجواب هو a ليش مو c ؟

q 17
if the lowest grade to get A in the quiz is 6 correct out of 7 what is the probability of getting A?
a-......
b-........
c- 11/8192
d-......

الجواب c ليش ؟

بالتفصيل بعد إذنكم