The average amount of rainfall throughout the summer months for Maritime Provinces is 281.5 millimetres (mm). A researcher chooses a random sample of 10 cities in Maritimes in 2008 and finds out that the average amount of rainfall was 265.2 mm. The standard deviation of sample is 17.4 mm. At ?=0.05, can it be concluded that mean rainfall in 2008 was below 281.5 mm?