Analysis and Approaches for IBDP Maths Ebook 1 | Page 285

Front Page
Exercise 92
1. A random variable X is distributed normally with a mean of 65 and standard deviation
of 2.5.
(a) On the following diagram, shade the region representing P( X � 60) .
[2]
(b) Write down P( X � 60) , correct to four decimal places.
(c) Let P( X �c) � 0.1 . Write down the value of c .
[2]
[2]
2. A random variable X is distributed normally with a mean of 4.41 and standard deviation
of 0.67.
(a) On the following diagram, shade the region representing P( X � 4.83) .
[2]
21
(b) Write down P( X � 4.83) , correct to four decimal places.
(c) Let P( X �c) � 0.3 . Write down the value of c .
[2]
[2]
www.seprodstore.com
277