Scores on a scholastic aptitude test are normally distributed with standard deviation

Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points. A researcher believes that the mean scores for the population of all such students is less than 500. State Ho and Ha for a test of this claim. Is the sample result statistically significant at the 1% level?