You must use Standard Normal Table (z-score table) to find the answers for following questions. To be able to get the full credit from following questions, you must show your calculations.

Finding probabilities of normal distribution:

3. A survey indicates that for each trip to the supermarket, a shopper spends an average of m = 45 minutes with a standard deviation of s = 12 minutes. The length of time spent in the store is normally distributed and is represented by the variable x. A shopper enters the store. Find the probability that the shopper will be in the store for each interval of time listed below. (20p)

1. Between 24 and 54 minutes
2. More than 39 minutes