1. [1] A random sample of size 25 is to be taken from a population which is normally distributed with

mean 60 and standard deviation 10.

(i) The sampling distribution of x is

(a) normal with mean 60 and standard deviation 10.

(c) normal with mean 60 and standard deviation 0.4.

(b) normal with mean 60 and standard deviation 2.

(d) normal with mean 12 and standard deviation 2.