Paper 6 October/November 2011 MATHEMATICS (9709/63) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

a) In a certain country, the daily minimum temperature, in ${}^ \circ C$, in winter has the distribution $N\left( {8,{\text{ }}24} \right)$. Find the probability that a randomly chosen winter day in this country has a minimum temperature between $7{}^ \circ C$ and $12{}^ \circ C$.
The daily minimum temperature, in ${}^ \circ C$, in another country in winter has a normal distribution with mean $\mu $ and standard deviation $2\mu $.
b) Find the proportion…