pls help ASAP

A researcher is interested to find out whether the mental ability of the children in a large community inhabited mostly by workers in factories of an industrial zone differs from that of the population (U = 100). She took a sample of 25 elementary and high school students from the school in the community. Using a standardized IQ test, she found the mean equal to 96 and standard deviation of 14. Use a 0.05 level of significance