**Please let me know if this enough data to answer the question** Assume we know the distribution of the population is normal assume that the sample

**Please let me know if this enough data to answer the question** 

Assume we know the distribution of the population is normal assume that the sample mean and standard deviation are good approximations for the population mean and standard deviation. Suppose we choose an arbitrary subject from our study and look at their contact time x with the advertising medium we have chosen What is:

(a) P ( x < 2 ) ?

(b) P ( x > 10 ) ?

(c) P ( 1 < x < 5 )?