Paper 7 May/June 2009 MATHEMATICH (9709/7) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

On average, 1 in 2500 people have a particular gene.
a) Use a suitable approximation to find the probability that, in a random sample of 10000 people, more than 3 people have this gene.
b) The probability that, in a random sample of $n$ people, none of them has the gene is less than 0.01. Find the smallest possible value of $n$.