In a set of 105 ACT scores where the mean is 24 and thestandard deviation is 5.3

In a set of 105 ACT scores where the mean is 24 and thestandard deviation is 5.39 (a) how many scores are expected to belower than 18.61 (one standard deviation below the mean)? (b) Howmany of the 105 scores are expected to be below 34.78 (two standarddeviations above the mean?)